Fitech Timing control tach numbers/ coil question

Afternoon, I got my TSP Billet distributor all hooked up today and rewired as required to allow Fitech to do the timing. Took my MSD 6Al out of the equation. Initially ran excellent, fitech black line hooked to negative post of the msd HVC coil ( already owned), ran strong, and no more erratic break ups at 4200 rpm( as the old distributor provided)

Drove it for a short time, then would have random rpm display on autometer tach and fitech handheld just drop off and pop back on, then...

Fitech Timing control tach numbers/ coil question

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