All the instruments (speedometer, heat gauge, fuel, Tac) are dead. They all read zero. Car drives fine, but low fuel beeper sounds occasionally even though I know it's full. Tried checking the fuses(7, 62) but they are good. Any ideas?

 

HHR clusters are "throw away" or non-serviceable self contained units, and it sounds like your cluster has up and died like they'll do on occasion.

A trip to your dealer can confirm the problem, then you'll have to decide on whether to go with a "new" recon unit, or check e-Bay for a used one.

 

I've had my radio display go crazy and pushing near the knobs corrected the problem. contacts I guess, But that is not where/what your problem is.