I've got a couple problems with the oil pressure gauge. One is with the idiot light coming on sporadically after the car has run awhile. Searching through the old threads, I found some ideas to check. The oil release valve sticking sounds like a good starting point. However, the actual needle part of the gauge never moves up or down. It is at zero when the car is off, but as soon as you turn the key on the gauge goes to 4 and never moves. Even with the engine off. The wiring appears fine. Anyone with any ideas on where to trouble shoot? If I can avoid it, I'd rather not just start replace wires, sending units, or the gauge until I hit upon the problem.