A couple days ago while driving my car, I stopped at a red light. The oil guage went to "0" ( zero ). I made a quick right turn to get off the road & the oil pressure shot up to 20 lbs. 20lbs is still not good but good enough to get home. After some deliberation, we put a mechanical guage on the port next to the sending unit. We felt it would be either be guage, sending unit or oil pump. The motor had recently been rebuilt . All new parts including oil pump, oil pressure sending unit were installed at rebuild. We took out the distributor ( we wanted to work on it anyway ). Put the oil primer shaft in & the mechanical guage went to 80 lbs. So now we felt either bad guage or sending unit. We then replace the sending unit with a new USA made unit. Started the car & the factory guage went to 60 lbs. So we knew it was a POS sending unit probaly made in China. I don't know where for sure the unit was made. But i'll never buy anything else if I can help it from China. But is it normal for the factory guage be 10 - 20 lbs off ??
