In SX Microcontrollers, SX/B Compiler and SX-Key Tool, George Frame wrote:

Capt. Quirk,

Most manfactures use a 60 tooth spur gear in conjunction with a mag pickup attached to the dyno.  The the output of the mag pickup is converted into a square wave and they just count the pulses for a fixed period of time.

On the engine there is a 40 tooth gear keyed to the crank and a single pulse generated at the camshaft.  The combination of these two signals provide all the information that is necessay to calculate engine speed, injection timing, and ignition timing.

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