BMW 3 Series Forum - Technical Talk on the BMW E21
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...