Also make sure you twist the wires coming from your distributor to the throttle body and as an added measure slide braided steel mesh over it and ground the one end of the mesh.
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