12 valve running great. Everything stock, for now. When I pull a load or stop after a long haul the oil pressure drops to nothing. Just the other day I pulled a trailer for about an hour, pulls and runs great, oil pressure while running is around 40 psi, right in the middle of the gauge. But when I get off the highway and idle the truck for a while, like when I'm backing the trailer up, I get a "check guages" signal and my oil pressure is zeroe'd out. Will stay this way till I give it a little gas and back up to 40 psi. All the while the truck seems to be running great. Bad sensor? Bad stock gauge? Bad motor?

 

run a real guage to be sure.

 

that will make 6 gauges. Thanks for the advice.

 

haven't installed that sixth guage yet, but every now and then it still drops out. I'm getting a little concerned. I'm at a stop sign idling, pressure reads about 20, then without warning it drops to zero for about 2 seconds and then back up to 20. Truck runs great, no drop in rpms, no sputtering, no loss in fuel pressure nothing, it doesn't miss a beat. Please tell me this is just a bad stock sensor and nothing major???

 

Hook up a manual guage in the same port that the sender goes into. This will give you "real" pressure readings. Probably just a sender though, very common.