Here is an update on the oil pump issue with the RV. Yesterday, I had another mechanic come with me to the rv to give me his diagnosis. He primed the oil pump and turned it with his drill, charged the battery and realigned distributer cap and the RV started right up! The oil pressure gauge was pegged passed the L. So at this point, it could be the pump, oil pressure sensor or a faulty gauge. we replaced thee sensor with a brand new one and still got no oil pressure reading on the gauge. Oil was poured into the engine through the valve cover opening and we waited for a few minutes. The engine was started and an inspection camera was into the engine through the hose coming out of the valve cover and we both saw oil flowing. the question now is Is the oil pressure gauge faulty or the pump? I am going to replace the gauge first. It was not moving at all. Any advice would be appreciated,thanks!