My 2003 chevy silverrado gas and oil gauge stopped working

lots of air pressure may have move out of place the wires. unplug, clean and plug back in each wire you may see that got in contact with the high air pressure. hope this may help you...
chevy pick ups have this issue. instrumental board stops working properly around 120,000 miles. gauges for gas,temp,oil,speed will not work properly. unless this happens under 100,000 miles you are covered. if not. 265 dlls ..this is what i paid for a chevy 2003 5.3 v8 vortex to get it repaired

with the key on/engine off floor the gas pedal 3 times the hold it down till the change oil light start blinking and go away,some times it take more than 10 sec,if it didn't work try it again,some times you have to try few times,to get it done

It could be your oil pressure sensor has gone bad.

Locate oil pressure sending switch on side of engine block(small black switch with one wire plugged onto it )kinda looks like a big spark plug.Unplug clean contact and plug back in.If gauge still not working need to replace switch.

spend the 12 dollars and get a universal mechanical oil pressure gauge, remove the oil sending unit on truck and screw new gauge into and start truck. Does it read pressure? I know people will say just replace oil sending unit but i like to visually check for a true oil pressure than to trust a light, at least you will know what pressure your motor has. if you have pressure then replace the sending unit. Most of the time when the sending unit goes bad your oil pressure gauge in the truck will run at 80 psi all the time. Since you have a light the sending unit just says it isn't getting pressure which turns a light on. So be safe and do as i suggest, if there is no pressure at the mechanical gauge then i hate to say it but you may have a bad oil pump. I honestly just think you have a bad sending unit,if you want just replace it and if lights go off thats good, but you still don't know what the pressure is and if you feel comfortable with this then do so.

Did you notice if you where low on gas either or both times this happened? I wonder if it's not a fuel pressure problem? Other wise might give it a tune up air filter, plugs, fuel filter. I've also noticed that chevy's are always happier with a fresh oil change.

Common problem on the 03-06 Avalanche instrument clusters, it's caused by failing stepper motors on the cluster's circuit board and it can be repaired. Check this page for more on how to get it fixed - Avalanche oil gauge fix

Sounds like the oil pressure sensor. Thatt is the easiest thing to change. If not its the gauge. Put voltage to the wires from the switch and see if the gauge stops jumping and stays pegged, if it does its the switch Good luck

the oil sending unit could be out or the pressure guage is malfunctioning is the service engine light on?

check the pressure with a oil pressure special test gauge, most likely it will be ok, then replace the oil pressure sending unit.