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  1. BMW 3 Series Forum - Technical Talk on the BMW E21
    Hello Chaps. Here goes. I bought an LED Air/Fuel Gauge a while ago and........well.......i have lost the instructions, and now want to fit it. It has 4 wires off of the back. 1 red, 1 black, 1 green & 1 yellow. I have figured that the red and the black are live and neutral, and i'm assuming...