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You could just tap into power up in the roof console, bring it down through the tube for the mirror base and drill a small hole to bring it back out for the mirror mounted detector. Watch the Valentine DIY install at M3Forum.net for details. It is the green/white wire in the second wire block (next to the very small block) that you tap use. Test with a test light with ignition on and off. The red/white wire next to it is always on so you don't want to use that.
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