The LP pressure reading was driving me crazy -- remember? Got great suggestions from many TDR members. I cleaned and treated LP electric connections. No change. Rop Thomas suggested I move the sensor off the VP pump and somewhere else than on the engine. Gary - KJ6Q sent a picture of where he installed his. Finally got those things done and guess what I found? The great shop (TDR member) that installed the LP sensor had left the electric leads from the sensor to the gage only finger tight! After making the corrections to the sensor as suggested and TIGHTENED the terminals, the pressure gauge works exactly as it should! Moral to the story? Don't even trust the best! Check everything!