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Old 05-07-2013, 11:41 AM   #1
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Unhappy oil pressure gauge install

Looking for some help! I have a digital oil pressure gauge I got off ebay that I installed with a glow shift sandwitch adapter but I don't think it is registering correctly. I am getting like 65psi at idle and at highest 120psi. oh yeah I have a 2001 GT. What is the best place to ground the sending unit? the battery or the frame? and does anyone know what the proper operating range is?

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Old 05-07-2013, 01:03 PM   #2
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The shop manual says 25 to 45 psi at 1500 rpm with the engine hot.

Were the readings you observed with the engine hot (up to full operating temperature) or cold?

The negative battery terminal would be the best ground source (but not needed), the engine block the next best (what I would use), the chassis the worst...
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Old 05-07-2013, 08:36 PM   #3
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Thanks for the help! The numbers I am getting is at hot temp ( engine is warmed up) at 1,000 rpm.
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Old 05-08-2013, 08:31 AM   #4
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The only real solution is to check the sending unit/gauge against a known pressure source--an air line with an accurate gauge would work. Or use a known accurate mechanical oil pressure gauge in place of the sending unit.

If the pressure is that high one possibility would be that the oil pump bypass valve is stuck/sticking...
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SOLD! - 2003 GT, UPR X, FRPP 24lb/h, Magnaflow, PP 70mm TB & plenum, Delta Force tuned,
Steeda UDPs, Ralco flywheel, RAM HDX clutch, 3.73s, 262 rwHP/305 lb-ft.

New ride (7/1/2013) 1998 Mercedes SL500-5.0L 32V VVT 326/347 HP/tq
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Old 05-08-2013, 11:02 AM   #5
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Ok I will try that. Thanks
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Old 05-08-2013, 11:18 AM   #6
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You will need to because right now it is unknown if the new gauge is wrong, or if the oil pressure is high...
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SOLD! - 2003 GT, UPR X, FRPP 24lb/h, Magnaflow, PP 70mm TB & plenum, Delta Force tuned,
Steeda UDPs, Ralco flywheel, RAM HDX clutch, 3.73s, 262 rwHP/305 lb-ft.

New ride (7/1/2013) 1998 Mercedes SL500-5.0L 32V VVT 326/347 HP/tq
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