Regardless of the distributor, you use the same tach adaptor when you use either a capacitive discharge ignition or direct fire EFI like electromotive. Use the MSD8920 which is for voltage triggered tachs.
Doug, if you want to send me one of those MSD units, I will see if I can get it apart and fix it. It would be interesting to see what is failing in these boxes. Perhaps I could make a business of fixing and upgrading MSD boxes.
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