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Part# 10-06754
MFR Model# TC875


This Tach Cap can be used to close off the tachometer drive of a Lycoming or Continental engine when an electronic tach drive is being used off the magneto or electronic ignition. 7/8" thread and Viton (R) O-ring to seal.


  • Machined from Aluminium L168
  • Chromic Annodised for greater protection
  • Viton O-ring included
  • Sutiable to plug the tacho drive fitting on a lycoming engine if an electronic tacho drive is used.
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Waaay too expensive. I think youre taking advantage of being one of the few people who carry this item.

Thomas N
December 21, 2019

Great cap, easy to install and lots of holes for safety wire.

Daniel L
March 25, 2019

We installed an Electronics International tachometer in a plane that we are rebuilding. We wanted to be certain that dirt couldnt enter through the now unused flex-cable drive so we ordered one of these caps. It is beautifully made and fits great. The only surprise was that EI provides a cap for this purpose. It isnt nearly as nice but would have done the job.

Terry M
February 11, 2019

The one we received was made from anodized aluminum. Very nicely manufactured and finished.

Airborne A
September 3, 2018

Gerry W
July 28, 2017

The grip section for the wrench is small

Chris D
November 5, 2019

This Item works fine, but honestly, too expensive!

Thomas N
October 20, 2019

Item arrived and was as advertised. Good quality and the AS price was the best I could find, and the part/pricing WAS hard to find - everywhere but here at AS. That said, this is a simple part and should not cost $20.00.

Jeff D
February 2, 2019

Good news: Nice clean way to seal off that tach drive boss on a Lycoming when you are not using it to drive your tachometer. Bad news: its quite expensive for a plastic molded part! It does have an o-ring seal in it to prevent oil leakage and lots of holes to safety-wire it.

July 31, 2018


Q: will this also work for an IO470 Continental engine?

The threadings for the tachometer cap will fit the IO470 Continental engine.

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