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Politically Incorrect
Join Date: Aug 2005
Location: Hoover, Alabama
Posts: 1,497
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I looked at the schematics for an '83 and all I could find was a black/yellow wire to the instrument cluster. That is the fuel injector pulsewidth signal the circuitry uses (among other things) to calculate when the shift light is on or off. The MPG meter circuitry uses this signal also. I don't believe either will work if this wire is disconnected.
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Edek
'87 924S
'91 535i
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