Voltage spikes!!!!

[Blindedlegacy]

Originally Posted by cre

I may have missed something because I have no idea what you're talking about here. Please elaborate.



The oil pressure gauge has only one wire running to the sender on the engine which is a variable ground of sorts. It gets it's power from the same circuit as the other dash components so if the dash lights light up and the tachometer works then the problem with the oil pressure gauge is most likely: a bad wire, a bad sender, unplugged or the engine is not well grounded.



No, the problem is inconsistent with a bad ECU. The two wires bolted together should be obvious... Look at the fusebox lid and the fusible link that's missing probably where they're supposed to go. Someone was being cheap or trying to bypass a fuse which kept blowing; replace it and see what happens. Replace the yellow wire fusible link while you've got it open just to be sure.

You have the rest of my suggestions for things to start with.

the coolant sending unit i just replaced it because it was always reading hot and the new one does the same thing.

and the oil pressure is connected to anything.

i saw a fusebox wiring harness for about 120 i think. you suggest i get that instead because who ever had that car before me is an idiot because there are custom jobs all over that place.