My oil pressure is a lot lower than normal. Normally it hangs out around 60, now it is getting well below 30. Anyone have any tips on whats up? I did just have the engine out to replace one of the pistons. But for a while the pressure was fine. I just changed the oil today, but that didn't bring it up. I have the 2 oil pressure senders on mine, one by dist. other by oil filter. Is it possible to read the pressure off the one that is not for the gauge? Thanks!