instrument cluster issue

If yes, then that is your ECU. GM did a terrible job of putting the ECU in a good spot, so it could be one of two things if not both.
1. Water has gotten into your ECU due to the fact that it is right below the windshield gutter
2. A wire is shorted out on your ECU.
What to do:
Take out your ECU and open it up. If there is water or any corrosion, try your best to file down/get rid of as much as you can with a metal bristle brush. Try and plug it back up and see if your gauges start working again. If not, its most likely a shorted wire.
Update this thread on what happens and good luck!
By the way I drove my car for 3 months with my gauges like that.
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