3-Series (E36)Chat relating to the BMW 3-Series from 1992-1999. Autodoodad
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I take it you mean the speedo input from the diff sensor to the cluster if so:
X271 = 12 pin black connector in the back of the cluster
Pin3 = brown/black (this is the earth for the speedo and fuel tank senders)
Pin4 = brown/red signal wire from diff speed sensor
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