Forum Discussion

Fairgrove's avatar
Fairgrove
Explorer
Sep 11, 2013

How to adjust oil pressure sender to gauge (potentiometer)?

My oil pressure sending unit went bad and I could not find a direct replacement. I purchased and installed one but the gauge is reading about 30 pounds too high. I thought I could install a potentio...
Class A
Sloop_Smitten's avatar
Sloop_Smitten
Explorer
Sep 12, 2013
You need to put the potentiometer in parralel (not series) with the pressure sender. Tap into the wire that goes from the sender to the gauge with one wire to the potentiometer and the other to ground. You should then be able to adjust the overall resistance close to the needed range.

Total resistance = (R1 x R2)/(R1 + R2)
R1 = Sender resistance
R2 = Potentiometer resistance

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