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Proper tachometer operation requires securely connected wiring and a good ground. Remember to disconnect the battery during   installation and to route the wiring so that the harness will not rub against sharp metal edges.
Dialing It In

Proper tachometer operation requires securely connected wiring and a good ground. Remember to disconnect the battery during installation and to route the wiring so that the harness will not rub against sharp metal edges.  View Related Article