Chevrolet Repair: Chevy tahoe 2004 2WD V8 5.3 L, oil pressure gauge, chevy tahoe

Question
Currently my tahoe has several issue that randomly pop on and off.
1- Oil pressure gauge drops to 0 rnadomly. (No lights come up) (Where is the oil presure gauge under the car?) what else could be wrong.
2 - RPM Meter has the same issue? On and off randomly.
3 - Speedmeter has the same issue...

I live in Texas an heat is over 100 F lately where I see it hapening more.. Not sure if this is relevant and the temp under the hood is much more..

Thanks

Answer
We are having several issues with these trucks, you will need a new instrument cluster(the gauge assembly)  The dealer is the only one who can reprogram the cluster, they usually run under 200 bucks and takes about 1/2 hour to do
Sorry that there's no easy fix for you to do yourself.
Jimmy