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You can buy the rearview mirror that the GM's use with the compass & temp built in but they are a little pricey, $275-$300. There is a unit sold at CW that is a wireless temp and a compass. We have that one but the temp sensor went dead and I have to replace it but other than that it worked good. Had it for over two years. I believe the name of the company that makes the mirrors for GM is Donnelly Corp. Check J.C.Whitney's website for that.
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