2004 Tahoe Gauge cluster not working

Hey I just bought a new 2004 Tahoe and took my factory radio out and put in a new Kenwood CD deck, Sirius Satellite radio, Sony Xplod amp, 10-disk Kenwood CD changer, a 1/2 farad capacitor and a bandpass box with 2 10" Kenwood subs. I also mounted my factory radio under the back passenger seat and turned it on so the Bose speakers will still work. This all works and sounds really good, but now my big problem is that my instrument gauge cluster does not work. All the fuses are fine and the wiring has been checked, and the guys from Best Buy that did the install had never seen this and there database did not show any similar problems. I have an appointment with the Chevy dealer in the morning but I was wondering if anybofy knew any ohter things I could check and is this just going to be a simple reset that is done on the radio since it has RDS on it. None of the gauges work, speedometer or Fuel, etc... Also the Driver information Center does not come on which has the odometer and the other programmable features, nor does the light that shows the gear that you are selecting and are in. Any help would be appreciated.

Thanks,
Patrick