What would cause this...two times now when I come to a stop after driving a fair distance on the highway, the oil pressure gauge dips down to 0 and the check gauges light comes on. Gauge needle swings around a bit at the stop and check gauges light flickers. After I get going, light goes out and truck continues to run fine. CEL never comes on. Mechanic said it might be the gauge, but is there anything else that would cause it? Thanks!

 

Oil pressure sending unit or oil pump going out light is wired to gage so it will alert you when low light nothing to worry about watch that gage

 

what year is the vehicle and what kind. i know the vortec 350's have this problem alot and it turns out to be the oil pressure sending unit on the back of the motor. i replaced one on friend's truck and it stopped doing that and is showing constant oil pressure. his did the same thing

 

Interesting...thanks! This one is a 1995 5.7 Z71 model.