I have a 3.8 2002 camaro. My speedometer and tachometer don't work. The speedo will jump all the way up upon start and slowly fall down. The airbag and check gauges lights stay on. All other gauges work fine. It runs and idles great. I have changed the instrument panel and the VSS. Any ideas what else it could be would be GREATLY appreciated!

 

you changed something I would start with checking connections.

Then Check fuses