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As you can see, the tachometer’s electrical circuit is a simple one. Operation is similar to an ammeter because an electromagnetic coil is involved. The magnetic field generated by the tachometer’s coil moves the needle clockwise around the tach face as engine rpm increases. Tach failure itself is centered around coil failure (a break in the circuit).
Instrument Panel Function & Electrical Basics

 As you can see, the tachometer’s electrical circuit is a simple one. Operation is similar to an ammeter because an electromagnetic coil is involved. The magnetic field generated by the tachometer’s coil moves the needle clockwise around the tach face as engine rpm increases. Tach failure itself is centered around coil failure (a break in the circuit).  View Related Article

 

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