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wiring question

posted by  someone claiming to be brickman on  Sat Apr 7 11:19 CST 2007 [RELATED]

I'm wiring a new VDO boost gauge to my 1990 740 and don't know what 2 wires to tap into for a live and ground. There is a red, white, blue/yellow and 3 yellow/white wires coming off from the back of my light switch. Which 2 should I tap into. Thanks as always







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