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 - Horsepower Defined - by Staff. Indicated Horsepower This represents the power developed in the enine cylinder as obtained from the pressure in the cylinders. This is pressure obtained from an indicator which shows cylinder pressures. Indicated horsepower does not represent the actual useful power delivered by the engine. Brake Horsepower This is the actual horse power delivered by the engine to the shaft. It is equal to the "indicated horsepower" less the friction of the engine. It is useful hor
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