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I would guess that you could possibly eliminate this by upgrading your spark plug wires. I say this because if you have a poorly insulated coil to distributor wire, you could be getting a surge transfering to your ignition coil power wire through electronic induction. The coil is a large capacitor, when you remove power from it, it discharges. You may need to just make sure that your coil power wire and your main distributor plug wire are farther apart. Do you have them zip-tied together? You could also add a diode inline on your ignition wire that would prevent any power from coming back up to the tach.
hope this helps.
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