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How does a tachometer measure an engine with an ignition system?

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Another type, used only with engines having an ignition system, operates by counting the pulsations of current or voltage in the ignition system, the number of these being proportional to the speed of the shaft.

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Similar questions: Does a tachometer count pulsations in engines with an ignition system? What does a tachometer count in an engine with an ignition system? [ Hide these questions ]

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