I have a '95 Ram with a 5.2L. I was driving it the other day and the oil pressure dropped, then came back all the way home. I changed the press sensor and nothing changed. I changed the pump, now I got nothing(pressure). I primed the pump, not sure if good enough tho. Is there anyway to turn the pump shaft and make sure the pump is primed from the top of the engine? Also, I put the new filter up dry. I do have a mechanical gauge on it and there is no oil getting into the tube to the gauge. Any help is much appreciated.