Automotive wiring colour coding
Submitted: Sunday, Feb 15, 2009 at 12:50
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Tony C
I am about to change an electric tachometer. the one currently in use is a 2 inch Speco and the wiring color coding is A-Green connects to the coil, B-Black connects to earth, C-Red connects to power at ignition. The replacement tachometer in unbranded and the three wires coming from it are coloured Blue,
Orange & Yellow. Could anybody advise me which goes where ?