Instrument cluster voltage regulator, on a 1970 Plymouth Valiant, 340 Duster

It’s not too hateful. Take your time. But what I don’t understand is if it’s bad the oil pressure won’t work either. You could check to see if you’re getting approximately five volts at the sending units for temp etc. it could be pins loose on printed circuit board or even bad traces etc on the board. Also could need better grounding of the instrument cluster housing.

Sorry We were typing at same time. If one gauge is working the limitor is operating. Maybe the temp sender is bad, can check with and ohm meter. The fuel could be the sender or the grounding to the tank isn’t good.