Questions and Answers
Monte Carlo Oil Pressure
Q. I have 1986 Monte Carlo V-8 305. Oil pressure gauge at 65 lbs with engine on or off, key on or off no difference factory gauge. Just purchased car. I know if gauge is at one end or other it means something but I don't know what. Electrical short? Bad ground? Need help don't know where to start.
A. There is a tan wire that runs from the dash gauge to the Oil Pressure Sending (OPS) unit. This wire is probably shorted to ground which would cause the gauge to read that high. It may also be a bad dash gauge.
What I would probably try is remove the instrument cluster, locate the tan wire and disconnect it. Then run a jumper wire from there to the OPS (unplugging the tan wire there) and if it operates normally, then it is the wire. You can then either locate the short in the factory wire or run a new wire in it's place.
If there is no change in the operation of the gauge, then the gauge itself is bad and will need to be replaced.
Additional Information provided courtesy of ALLDATA
