Carl, I don't but I would like to hear from someone that has worked out a problem with the factory tach when the Pertonix is wired correctly. Nothing is changed on the original wiring circuit to the coil, thru the tach or not. Maybe there is an issue with how the coil dumps and that is affecting tach signal, but on a I or II there is no Multi spark or anything. I would think the tach would see the same signal. I know that people have reported problems with the factory tach and Pertronix configuration before.
When the Pertonix is wired into the back side of the ignition switch it is just like installing any other accessory, stereo system, extra lights etc.. It's just taking a 12VDC power feed from the "ON" side of the switch.
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