Having a problem with my oil pressure gauge gone wild. The gauge reading are outta site high. Does anyone have a handle on this? Gauge, oil pressure switch, or sending unit? Also need to know where these are located. Sorry I forgot to mention this is a 3800SC lll.
I saw your post in the other thread, so like you, I didn't want to hijack it.
I don't know where the sending unit is on the 3800 conversion, but when you find it, see if you can't substitute a mechanical dial type oil pressure gauge in it's place, just to check oil pressure and to take the electrical circuitry out of the picture. They're cheap. Usually under $15.00. Many of them come with long nylon tubes so you don't have to install it down underneath the car.
Check the pressure at cold startup and then again once the engine has reached operating temperature. Then you'll have some reference points to tell if your electric circuit is operating correctly.