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Rasta Monsta · Joined: 12 Jul 2006 Posts: 11733 Location: PacNW

My OPG is bad, but has shown signs of life (flickers from accurate reading to pegged).

Anyone ever had any success reconditioning these things?
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Toofah King Bad

WeiBe (1987 924S 2.5t) - 931 S3

NEMESIS · Posted: Wed Oct 11, 2006 6:31 am Post subject:

Sure it's the gauge and not the sender?

Rasta Monsta · Joined: 12 Jul 2006 Posts: 11733 Location: PacNW

Indeed, after contorting myself in ways I never thought possible in order to replace the old one!
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Toofah King Bad

WeiBe (1987 924S 2.5t) - 931 S3

NEMESIS · Posted: Wed Oct 11, 2006 6:55 am Post subject:

OK the hard part is done.

I'd say for $25.75 I would just go ahead and replace the gauge. It's worth that much just to save the time and trouble of removing the trim ring on the gauge.

http://egauges.com/vdo_mult.asp?Type=Mech_Engine_Pressure&Series=Cockpit&Units

I wish I had some experience to share with fixing them.

Rasta Monsta · Joined: 12 Jul 2006 Posts: 11733 Location: PacNW

Thanks for the link, but I already have a spare. . .I sort of want to revive the green matching one.
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Toofah King Bad

WeiBe (1987 924S 2.5t) - 931 S3

-nick · Joined: 16 Nov 2002 Posts: 2699 Location: Cambridge, MA

Does the spare gauge read correctly?
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1980 931S
15psi boost, MS-II, EDIS, 951 IC, custom intake, Ford 5.0L throttle body, Forge BOV, WB o2, G31 w/LSD, 964 wheels, 968 rear sway, Bilsteins, 200# Welt. springs. A laptop, and a partridge in a pear tree.
1991 964 C4 Cabriolet

Rasta Monsta · Joined: 12 Jul 2006 Posts: 11733 Location: PacNW

It doesn't, it is calibrated for a different range.
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Toofah King Bad

WeiBe (1987 924S 2.5t) - 931 S3

-nick · Joined: 16 Nov 2002 Posts: 2699 Location: Cambridge, MA

All the gauges (in psi / bar / kpa) use the same sender as far as I know. So your extra should work if you have a bad stock gauge.

Sounds like time to pull out the multimeter and start tracking down the wires from the oil pressure sender to the gauge.
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1980 931S
15psi boost, MS-II, EDIS, 951 IC, custom intake, Ford 5.0L throttle body, Forge BOV, WB o2, G31 w/LSD, 964 wheels, 968 rear sway, Bilsteins, 200# Welt. springs. A laptop, and a partridge in a pear tree.
1991 964 C4 Cabriolet

Rasta Monsta · Joined: 12 Jul 2006 Posts: 11733 Location: PacNW

Nah, the sender and gauge have to match. The 931 sender and gauge are 0-150 PSI, and my spare only goes to 80.

rasta
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Toofah King Bad

WeiBe (1987 924S 2.5t) - 931 S3

Paul · Posted: Fri Oct 13, 2006 10:50 am Post subject:

Try using an analog volt meter instead of your gauge and see if the needle behaves the same.
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White 87 924S "Ghost"
Silver 98 986 3.6l 320 HP "Frank N Stein"
White 01 986 "Christine"
Polar Silver 02 996TT. "Turbo"
Owned and repaired 924s since 1977
Porsche: It's not driving, it's therapy.

Rasta Monsta · Joined: 12 Jul 2006 Posts: 11733 Location: PacNW

It's the gauge. With the ignition on, it pegs, but my spare reads zero.
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Toofah King Bad

WeiBe (1987 924S 2.5t) - 931 S3