FiTech EFI system

fklskv said
Funny you say that. I had a knock off dizzy in my car and I upgraded to msd. Now my tach jumps up and down randomly. I did the twisted wire, separated the wires to the box added the grounded shield wire and still not fixed.

Calls to msd results in someone talking down to you. No help whatsoever. Ok Msd expert tell me why the knock off works fine. No answer.

just wondering if the fitech is seeing that same tach signal
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Yes they work in the same manner. They both use a magnetic pickup distributor to trigger the ignition timing. After several attempts at shielding and twisting the wires with no success I decided (because of my electronics background that the noise must be coming in on the 12 volt supply line. So I made the filter, it's easy to make with the total cost being only a few dollars.