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On my '67 Fastback, I am going to install a tach (didn't come with one from the factory).

I've never put one on, so bear with me. The positive lead on my coil has a lead to the firewall. That lead is joined by the oil pressure sensor and manifold temp sensor (I think that is right) and connect into a three-lead plug in harness at the firewall.

Is the lead from the coil for a tach?
 
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