The problem to make an adapter is the input to your tach expects to get a sharp pulse from the coil. If you run that pulse through divider circuit, the output of a digital device may not be strong enough to trigger the tach.
I googled "tachometer pulse divider" and got a lot of hits, but none of them appear to do what you need: take the pulse from the primary side of a coil, condition it so it doesn't blow up the rest of the circuit, divide it by two, then generate a pulse strong enough to trigger the tach.
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