Low Oil Pressure

[R8RRICK]

THE OIL PRESSURE GUAGE ON MY 2006 SIVERADO 1500 2WD GOES UP TO 80 WHEN I START IT.I THINK IT SHOULD BE AT 40,BUT ON THE TAKE OFF,IT DROPWS DOWN TO 0 AND ONCE IT GETS UP AND GOING,IT SHOOTS BACK UP TO 80.ONE TIME IT STAYED AT 0 AND ON THE DISPLAY IT SAID,OIL PRESSURE LOW.WHAT IS CAUSING THIS.ANY SUGGESTIONS,I APRECIATE THE HELP.

[8.1HD/ALLISON]

Sounds like the oil pressure sending unit is on the fritz. I would check your oil pressure with a mechanical guage to verify no mechanical problems and check into replacing the sender.