Mirror Temperature Sensor

I had to replace my rear view mirror in my '97 Sub. The mirror I had had the compass feature. The one I bought also had the temperature feature. How can I make the temp feature work? Where (beside the dealer) can I get the sensors and where do they go, how do they hook up, etc. Thanks for your help!

Temp Sensor= 15047946

Sensor plug(with 2 wires about 12" long attached)= 12101856

You can get them at gmpartsdirect.com website.