GMC Envoy xuv 2004 all guages but speedometer out

I have a 2004 XUV the gauges are all out, not fuse checked already. When you start the truck instead of the odometer starting off with Driver 1 it says Unkown Driver. Sometimes it doesn't happen and everything is fine it is driving me nuts ! Any help is welcome

Anyone knows how to manually open the tail gate door on the envoy SUV? My regulator is broken and my stop light need replacement and can not open the door to do so.