aftermarket tach help
Senior Member
Joined: Sep 2014
Posts: 896
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From: Phoenix, A-to-Z
Year: 1988
Model: Cherokee
Engine: 4.0
CF Veteran
Joined: Feb 2010
Posts: 12,367
Likes: 23
From: Oroville, CA
Year: 1995
Model: Grand Cherokee
Engine: 4.0 with all of the noise and clatter
Red wire to a switched power source. Black wire is ground. Green wire goes to the negative side of the coil. The white wire taps into the dash lights.
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