Vector, his signature says he has a rebuilt engine. Not sure why he would be having this problem. First step is to determine the "real" oil pressure, preferably with a mechanical gauge. The stock electrical gauge is a rough approximation, at best.

I suggested replacing the oil pump as one step. It could be said that perhaps the oil pressure relief valve is malfunctioning, but it's right next to the oil pump, so the access steps are the same, no real gain there.

John B.