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hmmmm, wonder who taught you that? =)
I didnt have the Onstar, so I just mounted mine in the cubby hole. Great if you dont need to take it out. And it cleans it up a lot.
The wire just runs through the back and then I put the wire in the dash, and comes out to plug into the cig lighter. But I just saw they have a hardwire kit on Ebay for $25, so I would suggest that for a really clean look.