At Aircraft Accessories of Oklahoma, we offer the following Aircraft Tach Generator services and parts:

  • Overhaul
  • Repair
  • Bench Test
  • Exchange

What is an Aircraft Tachometer Generator?

An aircraft tachometer (tach) generator is an electromechanical device used to electronically measure the aircraft’s engine or rotor speed. Because they rely on voltage measurements to gauge speed, they are extremely precise within their specified range.

A tachometer generator consists of two components, the tach generator component which is attached to the engine or rotor, and the tachometer which is located near the pilot.

Attached to the aircraft engine or rotor machine shaft is an armature. One end of this armature rotates within the magnetic field created by the tach generator. As the engine or rotor RPM increases, the voltage frequency created by the rotating armature increases at a proportional rate. This voltage is measured by a voltmeter circuit, which translates that voltage reading into a matching speed value displayed on the tachometer.

We overhaul tach generators on site and keep a large supply in stock for exchange. We are also able to test the Hall Effect tach transducers manufactured by Electro Mech.


Aircraft Accessories of Oklahoma handles Aircraft Tachometer Generators from the following manufacturers:

  • Electro Mech
  • General Electric
  • Lear Siegler
  • Task / Donallco
  • TRW Globe


Wondering what to expect when you trust Aircraft Accessories with your next aircraft tachometer generator project? Our talented team of tach generator specialists will gladly provide you with a custom quote on request. For general questions, or to request a free quote, call or message us today.

Have Additional Questions on the Aircraft Tach Generator Overhaul Process?

Give us a call or email today – our experienced team is ready to go above and beyond to get you back in the air sooner.
Alan Brothers – Purchasing Manager & Tachometer Generator Expert