Dave H (MI)
Well-known Member
The oil pressure gauge needle is full over to the right. I disconnect the wire at the sender. I turn on the key...this makes the gauge needle flutter a little. I touch the wire to ground and either get no effect or a slight flutter of the needle. I removed the cover from the gauge unit and slipped the unit out of the dash and removed the plug. Not sure which wire in the plug is the one for the oil unit so I could not check continuity on the wire. The gauge slips out and you can see on the back there are three pins that are the electrical contacts for the gauge. None of them are marked. This is as far as I got. I am assuming that the gauge has a power supply and ground and that the third connection is from the sender and somehow moves the needle. I am going to ask my service guy to fax me a schematic of the engine harness and instrument cluster. Failing that I guess I can hook my meter to the wire at the sender and then test ALL the contacts in the harness and see if any of them get a reading. Still won't know how to test the gauge to see if it works. At this point I might just replace everything with new and see what happens.