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  1. B

    MSD Tach Help

    I have a 72 Mustang mach 1, i just recently installed a MSD 6AL and a MSD Blaster 2 Coil. Distributor has a Pertronix ignitor kit in it and it is the factory Tach. The tach was working perfect before the MSD box installation. The tach will read about 200 at idle and slightly go up to 300 when...
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