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Politically Incorrect
Join Date: Aug 2005
Location: Hoover, Alabama
Posts: 1,497
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I replaced my factory clock with a VDO Voltmeter.
According to the factory wiring diagrams, the Oil Pressure Gauge and Voltmeter use the same switched +12VDC wire. Circuit 15 (switched by ignition), black wire. Use the brown ground that originally went to the clock.
I also put a digital voltmeter directly on the battery and adjusted the new in-dash voltmeter to match.
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Edek
'87 924S
'91 535i
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