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#1321704 - 11/13/07 02:07 AM functional oil pressure gauge mod
Ciffer Offline
Over the Hill

Registered: 05/16/06
Posts: 4366
Loc: Witchataw KS
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?

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#1321711 - 11/13/07 02:16 AM Re: functional oil pressure gauge mod [Re: Ciffer]
dRock96Marquis Offline


Posting Addict

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



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

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#1322209 - 11/13/07 05:42 PM Re: functional oil pressure gauge mod [Re: dRock96Marquis]
JohnG Offline
Tech Admin
Grand Poobah

Registered: 06/15/01
Posts: 13025
Loc: Socialist state of MN
Make DAMN SURE you jump the OIL pressure gauge resistor, and not the ECT, FL, or Volts components or POOF!
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- 2004 Mercury Grand Marquis (GMQ) GS - aka "Data"
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#1322218 - 11/13/07 05:53 PM Re: functional oil pressure gauge mod [Re: JohnG]
Ciffer Offline
Over the Hill

Registered: 05/16/06
Posts: 4366
Loc: Witchataw KS
is there a ford part number for the older style sending unit?

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#1322230 - 11/13/07 06:02 PM Re: functional oil pressure gauge mod [Re: Ciffer]
Clayton Offline
Over the Hill

Registered: 07/14/05
Posts: 2037
Loc: South Carolina
According to DRock's linked pictures, the NAPA part# is OP6091.
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#1322285 - 11/13/07 06:58 PM Re: functional oil pressure gauge mod [Re: Clayton]
JohnG Offline
Tech Admin
Grand Poobah

Registered: 06/15/01
Posts: 13025
Loc: Socialist state of MN
If it weren't such a PITA to remove the cluster, I might try and work this mod into the '04.
_________________________
- 2004 Mercury Grand Marquis (GMQ) GS - aka "Data"
Save MILLIONS, vote to outsource our Executives!
What happeded to "government by the people, of the people and for the people"?
RIP Ronald W. Reagan "The Great #40"

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#1322311 - 11/13/07 07:39 PM Re: functional oil pressure gauge mod [Re: JohnG]
Ciffer Offline
Over the Hill

Registered: 05/16/06
Posts: 4366
Loc: Witchataw KS
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


Edited by Ciffer (11/13/07 07:43 PM)

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#1322353 - 11/13/07 08:41 PM Re: functional oil pressure gauge mod [Re: JohnG]
dRock96Marquis Offline


Posting Addict

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



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

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#1322465 - 11/13/07 10:53 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
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.


Edited by Timmn1 (11/13/07 11:01 PM)
Edit Reason: Spelling
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1997 Grand Marquis GS - Died
Now have a 2003 Grand Marquis LS

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#1322496 - 11/13/07 11:20 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
One other thing, if you still want to try it, the Motorcraft part number for the sending unit is SW873B
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1997 Grand Marquis GS - Died
Now have a 2003 Grand Marquis LS

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#1324550 - 11/16/07 12:41 PM Re: functional oil pressure gauge mod [Re: JohnG]
Robert Acorcey Offline
Member

Registered: 02/03/02
Posts: 335
Loc: Cherry Hill, NJ
 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
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2004 Mercury Marauder w/Blue Oval Chips Programming
1996 Impala SS (12.45 @ 108.8 NA350)

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#1324671 - 11/16/07 03:17 PM Re: functional oil pressure gauge mod [Re: Robert Acorcey]
RF_Overlord Offline

Poobah

Registered: 12/14/02
Posts: 7257
Loc: MA
 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.
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'03 Mercury Marauder (The Blackbird)
Trilogy Motorsports supercharged #61
Too many mods to list / Driveway Queen

'04 Grand Marquis LS Limited Edition (Spruce Green)
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'00 Grand Marquis GS (Silver)
Rotted frame and broken transmission crossmember
Being resurrected...slowly.

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#1332001 - 11/26/07 04:21 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 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.

_________________________
1997 Grand Marquis GS - Died
Now have a 2003 Grand Marquis LS

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#1332013 - 11/26/07 04:26 PM Re: functional oil pressure gauge mod [Re: Timmn1]
Ciffer Offline
Over the Hill

Registered: 05/16/06
Posts: 4366
Loc: Witchataw KS
 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?

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#1332021 - 11/26/07 04:36 PM Re: functional oil pressure gauge mod [Re: Ciffer]
Timmn1 Offline
Over the Hill

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

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