Easy... remove the mechanical tach and fit the light from the old one to the new eletric tach. Next run a wire from the back of the tach connection that looks like a small pole and run that to your ignition coil - negative side. Also make sure the ground wire (black) is mounted to one of the install bracket posts that hold the tach in place behind the dash.
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what connections on back ? sometimes they stamp them on or a bit of paper is glued , let me know or send pic.
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