Ok, my oil pressure gauge isn't working on my stock 305 4bbl vin H. I replaced the oil pressure switch witch didn't fix the problem. I have been driving it for a few months now with this problem and nothing seems to indicate no oil pressure, how do I figure out if it is the gauge or something else?

 

check the wiring to the oil pressure switch.

 

Put on a mechanical gage, even if just temporary.