Originally Posted by
power2weight
Every tach I've wired up works like this:
Red=12v switched
Black=ground
White=Illumination (put a voltmeter on it, it should drop voltage as the gauges are dimmed)
Green=tach signal, prob neg lead from coil or consult a wiring diagram
thats how it was for my autometer for my mustang
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Mechanical Engineer - Naval Surface Warfare Center PCD, Marine Corps. Counter IED Development
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