Originally Posted by CollectiveInk
Whew! Glad I didn't buy that then. It just seemed like a bargain compared to the 189-239 most were going for.
Hmm, so you can DIY one from salvage parts. Cool. I'd assume it's gotta come out of a fairly recent vehicle (less than 5 years old?) Might have to look into this further.
Go to a self service junkyard where they have GM cars made roughly any year after 2000. Just never buy a mirror that had OnStar built into it cause the harness has a ton of wires and it will be a pain to figure them out.
The auto dim and compass mirrors on cars like Chevy Impala/Monte Carlo are super easy to install. They have only 2 wire (ground and switched hot).
With a compass 2 more wire go to the temp probe usually mounted somwhere in front of the bottom end of the a/c condensor.
Oh, and don't buy that mirror on ebay that is advertised as #1 mirror on ebay. It is TOTAL TRASH. I got one as a gift and the POS would never read temp properly. It would keep jumping 5 degrees in either direction constantly.
A used GM car mirror will work the best. Ford/mazda ones are known to fail more often.