I just got a factory gauge with a tach and while doing a search found that I need three wires. My question is what number wires and colors do I exactly need?

I read something about the #8 spot, which is not occupied in mine. If this is what I need, where can I find the wire to hook it up and how do i hook it up?

TIA


'95 Contour GL, zetec mtx, drop in K&N, exhaust res removed, 4 10" Kenwoods powered by 1000W Visonik amp, 4 5"x7"/6"x8" Visoniks

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