Just wondering which or if any GM cars rear view mirror with compass will conect to our f-body's "clip" without addition wiring. Is this actualy compass sensor inside the mirror or located somewhere else in the car? Any attempted this?

 

C5, cadillac sls, and Silverado from my search on other boards and places. Also came up with http://www.electronics-pluz.com/aumiwimaplic.html
and http://www.mitocorp.com/flash/index.htm HomeLink® Comp/Temp Auto-Dimming Mirror with Map Lights: Part #50-GENK60