Greetings all. I have a '65 GT that I'm nearing the end of a restoration on. Recently as I was starting to test all of the electrical systems I found that the oil pressure gauge is constantly at 80. Doesn't matter if it has power, no power, even completely removed from the dash. It's not "pegged" at 80 meaning absolutely zero movement, if I move the gauge around a bit I can see that the needle wanders a touch, but it always reverts back to the top. Any guess as to what could be causing this? Thanks in advance.