functional oil pressure gauge mod

Posted by: Ciffer

functional oil pressure gauge mod - 11/13/07 02:07 AM

i remember seeing something written up a while back about making the oil pressure gauge functional. i searched and didn't find anything, does anyone have a link to the info?
Posted by: dRock96Marquis

Re: functional oil pressure gauge mod - 11/13/07 02:16 AM

http://www.supermotors.net/vehicles/registry/media/281470

http://www.supermotors.net/vehicles/registry/media/192127

Solder a jumper across the oil pressure gauge 20 ohm resistor on the printed circuit film and install the new sending unit.
Posted by: JohnG

Re: functional oil pressure gauge mod - 11/13/07 05:42 PM

Make DAMN SURE you jump the OIL pressure gauge resistor, and not the ECT, FL, or Volts components or POOF!
Posted by: Ciffer

Re: functional oil pressure gauge mod - 11/13/07 05:53 PM

is there a ford part number for the older style sending unit?
Posted by: Clayton

Re: functional oil pressure gauge mod - 11/13/07 06:02 PM

According to DRock's linked pictures, the NAPA part# is OP6091.
Posted by: JohnG

Re: functional oil pressure gauge mod - 11/13/07 06:58 PM

If it weren't such a PITA to remove the cluster, I might try and work this mod into the '04.
Posted by: Ciffer

Re: functional oil pressure gauge mod - 11/13/07 07:39 PM

i have to pull the cluster to replace my o/d off bulb anyways, i replaced all the bulbs in the spring, must not have got that one in all the way.

 Originally Posted By: Clayton
According to DRock's linked pictures, the NAPA part# is OP6091.


i saw that, i'd rather use a motorcraft sending unit if one is available
Posted by: dRock96Marquis

Re: functional oil pressure gauge mod - 11/13/07 08:41 PM

 Originally Posted By: JohnG
If it weren't such a PITA to remove the cluster, I might try and work this mod into the '04.


Are you kidding, John? lol

Removing the cluster is a BREEZE. Trust me ;\)
Follow the directions in the BOK forum under 92-05 cluster bulb replacement to get it out ;\)
Posted by: Timmn1

Re: functional oil pressure gauge mod - 11/13/07 10:53 PM

I tried that mod on my '97 Grand Marquis, it doesn't have a 20 ohm resistor on the back of the cluster. I happened to have an extra cluster, so I started experimenting with it. On the back of the cluster, the oil gauge has 3 terminals "B" "G" and "S" If you put 12 volts on B, and ground both G and S, the needle on the gauge goes to the midpoint on the scale. If this were a real gauge, the needle should have pegged at the high end of the scale.

I went as far as taking the gauge apart, thinking that the resistor was built into the gauge, if it's in there, it's under the windings for the gauge.

My guess is that the newer clusters will have the same fake gauge as my '97 has, and if that's the case, the mod won't work.
Posted by: Timmn1

Re: functional oil pressure gauge mod - 11/13/07 11:20 PM

One other thing, if you still want to try it, the Motorcraft part number for the sending unit is SW873B
Posted by: Robert Acorcey

Re: functional oil pressure gauge mod - 11/16/07 12:41 PM

 Originally Posted By: JohnG
If it weren't such a PITA to remove the cluster, I might try and work this mod into the '04.


John, as you know, I have a Marauder, with the external guage cluster, and it's still a royal PITA!

- Randy
Posted by: RF_Overlord

Re: functional oil pressure gauge mod - 11/16/07 03:17 PM

 Originally Posted By: Robert Acorcey
John, as you know, I have a Marauder, with the external guage cluster, and it's still a royal PITA!
Randy, not sure if you know this already, but the AutoMeter gauge in the Marauder is also a fake. You can buy a real working kit from AutoMeter, P/N 4327 that almost exactly matches the OEM gauge. Both the sender and the gauge itself must be replaced.
Posted by: Timmn1

Re: functional oil pressure gauge mod - 11/26/07 04:21 PM

I picked up an oil pressure/temp gauge assembly (The part number on the box is F6MZ-10883-AA) from a Ford dealer who was selling his excess parts inventory on ebay.

I took it out to my test set-up that I was using to check for fake gauges, and this oil pressure gauge pegs high when I ground the "S" terminal. With a 20 ohm resistor, it's about at midpoint on the scale.

The next thing to do is install it in the car, change the sending unit, and see what happens.

Posted by: Ciffer

Re: functional oil pressure gauge mod - 11/26/07 04:26 PM

 Originally Posted By: Timmn1


I took it out to my test set-up that I was using to check for fake gauges, and this oil pressure gauge pegs high when I ground the "S" terminal. With a 20 ohm resistor, it's about at midpoint on the scale.



what do those results indicate? that the gauge can be function but it not because of the resistor?
Posted by: Timmn1

Re: functional oil pressure gauge mod - 11/26/07 04:36 PM

A real gauge should peg on the high side when you ground the "S" terminal, and when you put a 20 ohm resistor between that terminal and ground, it should point around mid-point on the scale.

This gauge does that, which means it should work as a real, functioning, oil pressure gauge when I put it, and the new sending unit into my car. (Hopefully!)
Posted by: dRock96Marquis

Re: functional oil pressure gauge mod - 11/26/07 06:12 PM

 Originally Posted By: Timmn1
I tried that mod on my '97 Grand Marquis, it doesn't have a 20 ohm resistor on the back of the cluster. I happened to have an extra cluster, so I started experimenting with it. On the back of the cluster, the oil gauge has 3 terminals "B" "G" and "S" If you put 12 volts on B, and ground both G and S, the needle on the gauge goes to the midpoint on the scale. If this were a real gauge, the needle should have pegged at the high end of the scale.

I went as far as taking the gauge apart, thinking that the resistor was built into the gauge, if it's in there, it's under the windings for the gauge.

My guess is that the newer clusters will have the same fake gauge as my '97 has, and if that's the case, the mod won't work.


'97 was the first year for this, then.

My '96 cluster had the resistor:


My 98+ clusters do not have the resistor.
Posted by: Timmn1

Re: functional oil pressure gauge mod - 11/26/07 07:12 PM

My '97 cluster is almost exactly the same as your '96, right down to the round pads the resistor is mounted to, except that there is a trace running between the pads.
Posted by: Timmn1

Re: functional oil pressure gauge mod - 11/28/07 02:26 PM

I thought I'd update my progress so far on this thread.

The Motorcraft SW873B sending unit won't fit. There is a steel line running to the bottom of the power steering pump, and the sending unit hits it, and I can't get the threads to line up well enough to start them.

I found another sending unit, Motorcraft SW2433 and have ordered it. It is smaller than a SW873B, the only problem is that nobody stocks it, I should have it tomorrow.
Posted by: o0_C_0o

Re: functional oil pressure gauge mod - 11/28/07 04:19 PM

wait... so on this pic where would you place the jumper? cuz this pic looks like mine but doesnt look anything like the pic on the install thread... (i think its the resistor on the far left, correct?)
Posted by: Timmn1

Re: functional oil pressure gauge mod - 11/28/07 04:41 PM

Yes, it's the resistor on the left directly above where the wiring harness connector plugs in.
Posted by: o0_C_0o

Re: functional oil pressure gauge mod - 11/28/07 04:45 PM

ok, thanks....
Timmaaaayyy!!!(sorry)
Posted by: dRock96Marquis

Re: functional oil pressure gauge mod - 11/28/07 06:38 PM

Yep. It actually says OIL and 20 OHM right next to it. Would be hard to mistake it ;\)
Posted by: mattelderca

Re: functional oil pressure gauge mod - 11/28/07 08:10 PM

 Originally Posted By: Timmn1
I thought I'd update my progress so far on this thread.

The Motorcraft SW873B sending unit won't fit. There is a steel line running to the bottom of the power steering pump, and the sending unit hits it, and I can't get the threads to line up well enough to start them.

I found another sending unit, Motorcraft SW2433 and have ordered it. It is smaller than a SW873B, the only problem is that nobody stocks it, I should have it tomorrow.


Use the bottom plugged port and Get a 90 degree elbow in brass so the sending unit points back. Should fit then. Just leave the original in place or replace it with the plug removed from the bottom.
Posted by: Timmn1

Re: functional oil pressure gauge mod - 11/28/07 10:38 PM

 Originally Posted By: mattelderca
Use the bottom plugged port and Get a 90 degree elbow in brass so the sending unit points back. Should fit then. Just leave the original in place or replace it with the plug removed from the bottom.


Great idea! I wish I would have thought of that before I ordered the other sending unit.

Oh well.
Posted by: Timmn1

Re: functional oil pressure gauge mod - 11/29/07 04:42 PM

Well, I got the Motorcraft SW2433 sending unit this morning, and put it in. It replaces the stock sending unit perfectly, it looks as if it could have rolled off the assembly line that way.

It's harder to get, there are only two Ford models that use it, but well worth the wait.

One of them is a 1993 Mustang GT 5.0L 302CID w/gauge

My first mod, a fully functional oil pressure gauge!
Posted by: jmlock

Re: functional oil pressure gauge mod - 11/29/07 09:19 PM

Congrats. Now where you able to do it with your '97 cluster, or did you have to modify the other one you had?
Posted by: dRock96Marquis

Re: functional oil pressure gauge mod - 11/30/07 12:17 AM

 Originally Posted By: jmlock
Congrats. Now where you able to do it with your '97 cluster, or did you have to modify the other one you had?


I think he is using a 92-96 oil pressure GAUGE, inside his 97 cluster shell, with the new sending unit (and no jumpers used)

The 97+ clusters do not have the external 20ohm resistor, it is integral to the gauge. So, by using a -96 gauge inside his 97 cluster there is no resistor being used, which means it will read like a functional pressure gauge provided you use the correct sender.
Posted by: kustomizingkid

Re: functional oil pressure gauge mod - 11/30/07 12:40 AM

I don't understand why they made all the gauges give dummy readings in the first place.
Posted by: TechnoWeenie

Re: functional oil pressure gauge mod - 11/30/07 12:46 AM

 Originally Posted By: kustomizingkid
I don't understand why they made all the gauges give dummy readings in the first place.


Customers who don't know jack about cars don't like seeing gauges jump all over the place, even if it's perfectly normal..
Posted by: Timmn1

Re: functional oil pressure gauge mod - 11/30/07 12:49 AM

Both of mine were '97 clusters, the only way to make this mod work with a '97 cluster, is to use a temp/oil guage assembly from a '96 cluster. The oil gauge in the '97 (and probably newer) can't be used for this mod.

The '96 and the '97 clusters are identical with the exceptions of the oil guage and the resistor. To remove the assembly, you have to remove the 4 gold screws at the top of the cluster, and the other 4 at the very bottom. This will allow you to remove the "glass" and the black plastic frame surrounding the gauges. This will expose the gauge assemblies. Just grab the temp/oil guage assembly, and gently pull, it will unplug from the cluster.

The '96 gauge assembly will plug right into the '97 cluster, and since there is no resistor, you don't have to jump anything. I changed the gauge assembly without removing the cluster from the car.

Once you have done that, the only thing that remains is to change the sending unit. I recommend the Motorcraft SW2433, harder to get, but easier to install. The Standard part number is PS243, GP Sorensen is OPS134.
Posted by: Ciffer

Re: functional oil pressure gauge mod - 11/30/07 06:31 AM

great info timmn1, i'll have to go out and find a 96 cluster at a salvage yard next year.
Posted by: Timmn1

Re: functional oil pressure gauge mod - 11/30/07 08:29 AM

After doing the mod, and driving around with it, I found that the "reaction time" for the gauge is a bit slow, but it's a heck of a lot better than the fake gauge I had.
Posted by: Timmn1

Re: functional oil pressure gauge mod - 11/30/07 08:37 AM

 Originally Posted By: Ciffer
great info timmn1, i'll have to go out and find a 96 cluster at a salvage yard next year.


Next year? We're from the Midwest, when do we let a little cold and snow stop us from doing anything?
Posted by: jmlock

Re: functional oil pressure gauge mod - 11/30/07 07:40 PM

Thank you, drock and Timm.
Posted by: Timmn1

Re: functional oil pressure gauge mod - 11/30/07 10:35 PM

You are Welcome, hopefully, the next person who tries this will find all of this helpful.
Posted by: Ciffer

Re: functional oil pressure gauge mod - 11/30/07 10:54 PM

 Originally Posted By: Timmn1
 Originally Posted By: Ciffer
great info timmn1, i'll have to go out and find a 96 cluster at a salvage yard next year.


Next year? We're from the Midwest, when do we let a little cold and snow stop us from doing anything?


i broke my foot and don't feel like hobbling around salvage yards checking VINs, it isn't a cold issue. besides my car is parked in someone else's garage for the winter.
Posted by: Embassy

Re: functional oil pressure gauge mod - 12/01/07 12:37 PM

 Originally Posted By: Timmn1
Both of mine were '97 clusters, the only way to make this mod work with a '97 cluster, is to use a temp/oil guage assembly from a '96 cluster. The oil gauge in the '97 (and probably newer) can't be used for this mod.

The '96 and the '97 clusters are identical with the exceptions of the oil guage and the resistor. To remove the assembly, you have to remove the 4 gold screws at the top of the cluster, and the other 4 at the very bottom. This will allow you to remove the "glass" and the black plastic frame surrounding the gauges. This will expose the gauge assemblies. Just grab the temp/oil guage assembly, and gently pull, it will unplug from the cluster.

The '96 gauge assembly will plug right into the '97 cluster, and since there is no resistor, you don't have to jump anything. I changed the gauge assembly without removing the cluster from the car.

Once you have done that, the only thing that remains is to change the sending unit. I recommend the Motorcraft SW2433, harder to get, but easier to install. The Standard part number is PS243, GP Sorensen is OPS134.


Excellent information. Looks like I'll be pulling two '96 instrument clusters the next time I'm at the salvage yard.

This information should be added to the BOK section.
Posted by: Bobert2647

Re: functional oil pressure gauge mod - 12/01/07 02:00 PM

I'm sure dRock will have a write up done soon.
Posted by: Ciffer

Re: functional oil pressure gauge mod - 12/01/07 05:44 PM

TCCoA has an article on the oil pressure gauge, but does not mention anything about the 97+ gauges, might have never changed from the from the -96 style for the MN12/FN10s.

last article on the page
http://www.tccoa.com/articles/engine/index.html#
Posted by: Timmn1

Re: functional oil pressure gauge mod - 12/29/07 12:01 AM

Just thought I'd update this, I've put about 3000 miles on since I did the mod, and it's working like a charm. The only real complaint is that the "response time" for the gauge is a bit slow, but other than that minor complaint, I'm happy!
Posted by: Ciffer

Re: functional oil pressure gauge mod - 01/07/08 05:41 PM

cool, i am planning to do this mod next spring
Posted by: K-9Vic

Re: functional oil pressure gauge mod - 01/28/08 05:14 AM

Great information, I need to install this for my oil pressure gauge I just installed. The factory sending unit just pegs the gauge as it is the dummy sender, I will go ahead and order the Motorcraft SW2433. Then I will have a real oil pressure gauge on my A-Pillar.
Posted by: jmlock

Re: functional oil pressure gauge mod - 01/28/08 02:18 PM

^^^ Are there any pics of the new ride yet?
Posted by: K-9Vic

Re: functional oil pressure gauge mod - 01/30/08 01:35 PM

 Originally Posted By: jmlock
^^^ Are there any pics of the new ride yet?


Yes, posted this in the lounge
https://www.crownvic.net/ubbthreads/ubbth...266#Post1381266
Posted by: peteinsf

Re: functional oil pressure gauge mod - 02/28/08 07:24 PM

Guys,

I am assuming that this will work on my 2001. To confirm I just need to find a 1996 movment? (and the sender of course)

Pete
Posted by: hlbly

Re: functional oil pressure gauge mod - 02/28/08 08:11 PM

For the record:

1996 CV oil pressure gauge, engine unit (sender): D4AZ-9278-A
(Motorcraft SW-1311)
1996 CV Oil pressure gauge, instrument panel unit: F6AZ-10883-
BA

This from the 1996 passenger car parts book-part #'s subject to supercession.
Posted by: hlbly

Re: functional oil pressure gauge mod - 02/29/08 07:29 AM

Strike that first item. The correct engine unit is E9SZ-9278-A or Motorcraft SW-2220. The SW-1311 is for vehicles with the electronic cluster.
Posted by: peteinsf

Re: functional oil pressure gauge mod - 03/04/08 04:37 PM

Hmm,

The an on-line search yelds two different 1996 "temp gauge" options.

1995 returns one.

Any thoughts on what one to order for my 2001?

================================================

Collision Catalog - 1996 - Ford - Crown victoria
Instrument panel, Cluster and switches, Temp gauge, W/o police package, To 2/96 - 1995-97 Mechanical - 1995-97 Mechanical $72.78 $48.04 $0.00 $48.04

Collision Catalog - 1996 - Ford - Crown victoria
Instrument panel, Cluster and switches, Temp gauge, W/o police package, From 2/96 - 1995-97 Mechanical - 1995-97 Mechanical $72.78 $48.04 $0.00 $48.04

Collision Catalog - 1995 - Ford - Crown victoria
Instrument panel, Cluster and switches, Temp gauge, W/o police package - 1995-97 Mechanical - 1995-97 Mechanical $61.03 $40.28 $0.00 $40.28
Posted by: troyco

Re: functional oil pressure gauge mod - 03/04/08 08:36 PM

i just installed '97 CVPI cluster in my '96,(had to swap out all the guages, long story...) and would like to do this mod, however my '96 cluster doesn't have a resistor like dRock's does (his circuit is yellow, both mine are red...), nor does it have one on the back of the gauge. does that matter? will it still work using my '96 gauge? i'm thinking there may have been a difference, as dRock's car is an LS, and mine's a GS....
Posted by: dRock96Marquis

Re: functional oil pressure gauge mod - 03/05/08 02:12 AM

No, probably a build date change.

What is the build date on your '96 cluster?
Here's mine:
Posted by: troyco

Re: functional oil pressure gauge mod - 03/05/08 07:44 PM

it's pretty illegible..... \:\(
what i can pick up is 22 may and it's either 1995 or 1996.....

here's what i can make out
GRAND MARQUIS EM114 200 KPH
F6MF-10849-BB
22 MAY 199-

that's the best i can make out. just barely.
Posted by: troyco

Re: functional oil pressure gauge mod - 03/09/08 07:27 PM

ok. i think i'm just going to find another oil pres. gauge at the wreckers with those p/n's.....my only question is what kind of wiring is required to hook up that sending unit after i install it on the engine??
Posted by: peteinsf

Re: functional oil pressure gauge mod - 03/19/08 11:17 AM

Just a general question. What years have interchangeable (non-LX) clusters?

1995-2002
2003-2007? (my guess)
Posted by: dRock96Marquis

Re: functional oil pressure gauge mod - 03/21/08 12:15 AM

 Originally Posted By: peteinsf
Just a general question. What years have interchangeable (non-LX) clusters?

1995-2002
2003-2007? (my guess)

LX clusters also interchange so long as they are analog and not optional digital.

1992.5-1994 (1992 as well but incorrect shift patter is printed on speedo) cv for cv and gmq for gmq (different dashes)
1995-1997 cv/gmq
1998-2002 cv/gmq
2003-2005 cv/gmq


The speedo head itself (not entire cluster) will swap 95-02 and it appears 03-05 as well. CVPI use 140mph head
Posted by: dRock96Marquis

Re: functional oil pressure gauge mod - 03/21/08 12:16 AM

 Originally Posted By: troyco
it's pretty illegible..... \:\(
what i can pick up is 22 may and it's either 1995 or 1996.....

here's what i can make out
GRAND MARQUIS EM114 200 KPH
F6MF-10849-BB
22 MAY 199-

that's the best i can make out. just barely.

I would assume 1996, which means the external resistor delete was a mid-year change
Posted by: Timmn1

Re: functional oil pressure gauge mod - 03/21/08 06:49 AM

 Originally Posted By: hlbly
Strike that first item. The correct engine unit is E9SZ-9278-A or Motorcraft SW-2220. The SW-1311 is for vehicles with the electronic cluster.


The Motorcraft SW-2220 is just a normally open pressure switch, whenever the oil pressure gets to a certain level, it closes. That is used with the "fake" gauge and the "real" gauge with the resistor.
Posted by: Timmn1

Re: functional oil pressure gauge mod - 03/21/08 07:02 AM

 Originally Posted By: troyco
ok. i think i'm just going to find another oil pres. gauge at the wreckers with those p/n's.....my only question is what kind of wiring is required to hook up that sending unit after i install it on the engine??


If your original sending unit looks like a Motorcraft SW-2220, it has a threaded stud coming out of the top that the wire connects to, you shouldn't have to make any modifications to the wiring at all.

On the newer cars, Ford changed the sending unit connector, in that case, you have to either change the connector or build an adapter.