by Alan Handley
Published: May 25, 2018 (3 weeks ago)

Does anyone know how the electronic tacho works in the Beech Duchess?  I am looking to understand how the pick up works that senses the engine revolutions from the toothed ring gear. I need to find out what the sensor part number is and if there is a current equivalent part available to purchase. My guess is that the device is a magnetic speed sensor with a two wire output  that provides an ac voltage from the coil wrapped around a magnetic core when the toothed ring gear rotates. My questions are, what is the voltage range output? and what is the impedance of the coil? If any one knows.

Many Thanks,



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