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The electrical connections are easy, and the tach should come with sufficient instructions to help you with this. Clean the top of the ignition coil so you can clearly read “–” or “DIST” on the terminal that the tach lead attaches to. Use a grommet to insulate the hole in the firewall where the wires pass through to keep the metal from chafing them, which can lead to an electrical short. A good ground is often overlooked when installing electric accessories and is very important.