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#1332080 - 11/26/07 06:12 PM Re: functional oil pressure gauge mod [Re: Timmn1]
dRock96Marquis Offline


Posting Addict

Registered: 02/22/05
Posts: 24393
Loc: Maryland
 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.
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-Derek
-Panther info & FAQs-



Former owner of a Grand Marquis with a few mods, Grand Marquis "LSE S/C"

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#1332125 - 11/26/07 07:12 PM Re: functional oil pressure gauge mod [Re: dRock96Marquis]
Timmn1 Offline
Over the Hill

Registered: 09/21/07
Posts: 1919
Loc: Near I-80 & I-57
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.
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1997 Grand Marquis GS - Died
Now have a 2003 Grand Marquis LS

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#1333570 - 11/28/07 02:26 PM Re: functional oil pressure gauge mod [Re: Timmn1]
Timmn1 Offline
Over the Hill

Registered: 09/21/07
Posts: 1919
Loc: Near I-80 & I-57
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.
_________________________
1997 Grand Marquis GS - Died
Now have a 2003 Grand Marquis LS

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#1333690 - 11/28/07 04:19 PM Re: functional oil pressure gauge mod [Re: Timmn1]
o0_C_0o Offline
Member

Registered: 02/13/07
Posts: 465
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?)


Edited by o0_C_0o (11/28/07 04:23 PM)
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#1333714 - 11/28/07 04:41 PM Re: functional oil pressure gauge mod [Re: o0_C_0o]
Timmn1 Offline
Over the Hill

Registered: 09/21/07
Posts: 1919
Loc: Near I-80 & I-57
Yes, it's the resistor on the left directly above where the wiring harness connector plugs in.
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1997 Grand Marquis GS - Died
Now have a 2003 Grand Marquis LS

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#1333721 - 11/28/07 04:45 PM Re: functional oil pressure gauge mod [Re: Timmn1]
o0_C_0o Offline
Member

Registered: 02/13/07
Posts: 465
ok, thanks....
Timmaaaayyy!!!(sorry)
_________________________
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-Flex-a-lite Black Magic Fan (brand new in box)..........$20 (Crackhead @ work) laugh
-Headlight Relay Upgrade

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#1333824 - 11/28/07 06:38 PM Re: functional oil pressure gauge mod [Re: o0_C_0o]
dRock96Marquis Offline


Posting Addict

Registered: 02/22/05
Posts: 24393
Loc: Maryland
Yep. It actually says OIL and 20 OHM right next to it. Would be hard to mistake it ;\)
_________________________
-Derek
-Panther info & FAQs-



Former owner of a Grand Marquis with a few mods, Grand Marquis "LSE S/C"

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#1333894 - 11/28/07 08:10 PM Re: functional oil pressure gauge mod [Re: Timmn1]
mattelderca Offline
Member

Registered: 09/17/07
Posts: 421
Loc: Whitby, Ontario, Canada
 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.


Edited by mattelderca (11/28/07 08:12 PM)
Edit Reason: shorted my response
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#1334034 - 11/28/07 10:38 PM Re: functional oil pressure gauge mod [Re: mattelderca]
Timmn1 Offline
Over the Hill

Registered: 09/21/07
Posts: 1919
Loc: Near I-80 & I-57
 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.
_________________________
1997 Grand Marquis GS - Died
Now have a 2003 Grand Marquis LS

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#1334635 - 11/29/07 04:42 PM Re: functional oil pressure gauge mod [Re: Timmn1]
Timmn1 Offline
Over the Hill

Registered: 09/21/07
Posts: 1919
Loc: Near I-80 & I-57
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!
_________________________
1997 Grand Marquis GS - Died
Now have a 2003 Grand Marquis LS

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#1334798 - 11/29/07 09:19 PM Re: functional oil pressure gauge mod [Re: Timmn1]
jmlock Offline


Posting Addict

Registered: 08/14/04
Posts: 21987
Loc: Harris County, TX
Congrats. Now where you able to do it with your '97 cluster, or did you have to modify the other one you had?

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#1334893 - 11/30/07 12:17 AM Re: functional oil pressure gauge mod [Re: jmlock]
dRock96Marquis Offline


Posting Addict

Registered: 02/22/05
Posts: 24393
Loc: Maryland
 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.
_________________________
-Derek
-Panther info & FAQs-



Former owner of a Grand Marquis with a few mods, Grand Marquis "LSE S/C"

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#1334904 - 11/30/07 12:40 AM Re: functional oil pressure gauge mod [Re: dRock96Marquis]
kustomizingkid Offline
Poobah

Registered: 11/18/06
Posts: 5070
Loc: Minnesota
I don't understand why they made all the gauges give dummy readings in the first place.
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#1334906 - 11/30/07 12:46 AM Re: functional oil pressure gauge mod [Re: kustomizingkid]
TechnoWeenie Offline
Banned
Posting Addict

Registered: 10/02/04
Posts: 22857
Loc: The perimeter
 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..
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#1334907 - 11/30/07 12:49 AM Re: functional oil pressure gauge mod [Re: jmlock]
Timmn1 Offline
Over the Hill

Registered: 09/21/07
Posts: 1919
Loc: Near I-80 & I-57
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.
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1997 Grand Marquis GS - Died
Now have a 2003 Grand Marquis LS

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