Oil Pressure Guage Pegged at 80psi???

[tsb09000]

I took a little roadtrip today in my 03 5.3 tahoe and I noticed the oil pressure guage was pegged at 80psi. It does go back to zero when I shut the truck off but right back up to 80 when I start it. Everything seems and sounds alright but it's got me quite paranoid. I haven't had time to really look into things yet but hopefully somebody can steer me in the right direction as to what to check. I'm leaning towards the guage itself or some sensor or ???

Anybody ran into this before??

Thanks!!

 

[sumo]

Probally a bad sending unit. Whats it read with the key on, engine off? if you unplug the harness and ground it, the gauge should read zero. This means the actual gauge is ok and most likely sending unit needs to be replaced..

 

[killer20072001]

Either sending unit or a bad motor in the gauge is pretty common. Mine does the exact same thing.

 

[tsb09000]

It reads right at 60 with the key on engine off. Any helpful tips on the sending unit and possible cost?

 

[killer20072001]

Its on the back drivers side mannifold im pretty sure. The sending unit I got from O'reillys was $40

 

[jmyler]

yea it's on the back of the block behind the manifold. You need a special socket i believe.