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Tachometer


Tachometer refers to an instrument that tells the driver how fast the engine is rotating, and it is indicated in RPM.

  • A tachometer or tach measures engine rpm. The tach may be electric, optical or magnetic. 
  • It counts the electrical pulses in the ignition system and reports the result as engine speed. This tells the driver how fast the engine crankshaft is turning. Then the driver can keep the speed within the allowable range for engine operation. 
  • Also the driver can keep the speed below the Redline which marks the maximum  allowable engine speed
  •  A magnetic tachometer is usually combined with the magnetic timing tester. It is used a probe inserted in the engine probe hole