2006 Chevy Cobalt LS Dual touchscreen stereo installation problems
 

I have a 2006 Chevy Cobalt LS I'm trying to install a dual touch screen stereo. However when I plug it in the theft light comes on and my speedometer and fuel gauge stop working I also lose audio. When I plug it in while on the throttle I gain audio but nothing else. Any thoughts on how to fix this?