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Should have four wires: Positive, Ground, Light, and Tach. Put ground first! I made this mistake and took out all the lights in my dash. Hook the tach wire up to the male end on the distributor cap (you'll have to route it through the firewall). Hook the positive up to a nearby wire or open spot in your fuse box. I tapped off the radio. Hook the light into your panel instrument light circuit.

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15y ago
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Q: How do you install a sunpro super tach 2 in a 73 Chevy Nova?
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