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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Today's Featured Article - Choosin, Mounting and Using a Bush Hog Type Mower - by Francis Robinson. Looking around at my new neighbors, most of whom are city raised and have recently acquired their first mini-farms of five to fifteen acres and also from reading questions ask at various discussion sites on the web it is frighteningly apparent that a great many guys (and a few gals) are learning by trial and error and mostly error how to use a very dangerous piece of farm equipment. It is also very apparent that these folks are getting a lot of very poor and often very dangerous advice fro
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