I have it in my car. i got power from the check panel so it turns off when you pull the key from ignition. dimming, compass and homelink are fully automatic, doesn't need anything but power. you can hook up the reverse signal and then it won't dim if you're backing up so you can see but it's not really needed. i personally love it! it appears to be hard to program the homelink sometimes but it might be just me.
Also i have a convertible so it goes right on the stock location on the windshield.
EDIT:
There are a few versions of that mirror. i believe there is one that has the homelink but no compass and maybe no dimming either but that i'm not sure of.
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