2003 GMC Yukon Control Panel Gauges

My gauges are not working. None of them (tac, speed, oil pressure, battery, fuel, all of them). Sometimes they will come back on for a few miles, but then go back off. The last couple of times they have come back on the needles are stuck where they were. I can unhook the positive on my battery and the gauges drop back down. I have checked the fuses, all are good. Also, I believe that this may also be causing my battery to be dead. If I do not drive it for a couple of days, the battery is dead as though something is left one and still drawing power from the battery when it should not be. I have had my battery and alt. Checked and they are good and recently replaced by starter about 3 months ago. This is around the time everything started to happen when the panel. I have checked the starter hookups and everything was re-installed the way it was supposed to be. Is this a short in the wiring, or a sensor failure?