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    What is the best way to run a wire from behind the bumper to the tail lights?

    Just got the new 2009 M5 GT and now planning to install this back up sensor, which doesn't need to drill holes on bumper. Have learned a lot from this forum, like how to remove bumper, tail light housing, etc. Now I have one last problem: I need to tap into the back-up light so that it can...
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