I picked up this mirror for $5 at the junkyard. It came out of a '97 Oldsmobile. It has a built-in compass and also features automatic dimming. Wiring was only 3 wires: Black = Ground, Pink = switched 12v, Green = reverse light switch to turn off the Auto Dim while backing up. I already have the hot and ground wire already at the mirror location because I had a Cutlass mirror with map lights hanging there last year. The only thing I have to do is change the power wire from hot to switched. This mirror does not like to stick to the generic one size fits all button that I purchased at the discount parts house. I had to buy the correct button from the dealer for the asking price of $14. Now if I can only get the old button un-glued without cracking the windshield.