here is what was posted on another site
Ok This is From The Engine side of the plug on the 318i to the Chassis side of the plug on a 325i Engine.
Violet/green-Violet/red(both large guage)
Green/yellow-Green/yellow(both large guage)
Greeb-Green(both large guage)
Black/yellow-Black/yellow and (smallguage) black/green
Left on the 325i side You'll have a Yellow/White wire(Fuel rate ouput)
Black(Engine speed output)
Brown/black(Check Engine light)
Plus some other wires but I never found there functions.
I never tested this plug and made the conections based on the Feature that wire did and not it's color.