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three wires, 12v, gnd, and one hooked to the reverse light to clear the mirror if dimmed.
For a mirror that has the temp it may involve a few more wires and a sensor, but i'm not sure.
All you gotta do is remove your existing mirror entirely, and mount the temp/compass mirror most likely using one of those metal button mount like most card have them nowadays.
You'll have to remove the headliner and tap into the corresponding wires for 12v, ground, etc....i can recommend you the same guy i got my mirror from on ebay for about $70.00
Last time i checked he had a lot of variety and was very helpful when it came to installing info
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