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I had a VDO tach laying around the house so I put it in my truck.
Tach has 4 wires, Blue, white, red, green.
Blue and white are thicker wires. Assume the red and green are ground and illimination. Anyone know what the other wires are and where they hook up?
seems to me like most tachs green wire goes to the coil. Black wire is a ground. Blue is the light, and white goes to a switched power source. I could be wrong, and if anyone else has any ideas please correct me.