Ditto. I installed a Crane Hi-6 and have the same problem. I've tried to wire the tach directly to the neg terminal of the coil and also to the tach signal on the ign. box. My monster tach works fine of course, but I am curios myself.
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82 Mercury Capri 302.
Comp. Cams
Tremec 3550
3.73's
12.8@106 N/A
Kevin's Capri