Topic: Oil pressure guage
in Forum: C3 Electrical

Actually I put my keyboard in motion before I put the mind in gear. The gauge is wired as follows on a '79. There is a power wire coming from the fuse panel going to the center cluster that powers all the gauges. The ground part comes in from the sender. The whole center gauge cluster has a printed circuit board to distribute power and ground. When I changed my radio from stock to a din type I recall having to take care when putting the cluster back in. As the oil pressure rises and lowers, it varies the electrical ground potential to the gauge via it's connection to the block where it is grounded. So this puts a lot of possibilites in it. Sender, circuit board, gauge, could be any one of these. I think the first thing I would try is the sender, cause it's the simple to get at and change. Then from there you may have to pull out the center cluster, check the connection from the harness, the circuit board for any breaks or suspect the gauge itself. Sorry for the quick answer before, but I think the sender may be the fly in the ointment.
Dave

