Thumbs 1
Thumbs 1

UMA Magnetic Tach Sender T1A3-4

Add to Wishlist
Part# 10-05334
MFR Model# T1A3-4 2 PULSE


T1A3-4 Tach Sending Unit.
California Prop 65 Warning Symbol

WARNING: Cancer and Reproductive Harm -

  • Frequently Purchased With
  • Customers Also Viewed


Installed the UMA tach sender to provide an RPM input to a Dynon EMS after replacing the magneto with a Surefly ignition. I never considered the previous P-lead derived RPM indication to be jerky, however with the UMA sender in place there is now a noticeable smoothness and fluidity to the RPM indication. Very happy.

Malcolm K Verified Purchase


September 20, 2023

Perfect match for the Garmin G3X. The sender swivels making it very user friendly in tight installations . The lead does require soldering .

March 8, 2021

Brilliant service, very speedy delivery

Gary C
November 10, 2019

This tach sending unit can be used with any unit that can work within specs below: Input voltage (+VSS) range is +5 to +28 volts DC, current draw 10mA. Output - square wave +5 to +VSS, 4 pulses per tang revolution, Impedance is 2.7K ohm. Since ratio between the engine and mechanical port is 2:1, digital reader have to be set to 2 pulse per rev.

August 23, 2016


Please note, Aircraft Spruce's personnel are not certified aircraft mechanics and can only provide general support and ideas, which should not be relied upon or implemented in lieu of consulting an A&P or other qualified technician. Aircraft Spruce assumes no responsibility or liability for any issue or problem which may arise from any repair, modification or other work done from this knowledge base. Any product eligibility information provided here is based on general application guides and we recommend always referring to your specific aircraft parts manual, the parts manufacturer or consulting with a qualified mechanic.

Q: Can the UMA Magnetic Tach sending unit be used directly with MVP-50P?

As these products are both manufactured by different companies, neither has provided information regarding compatibility.

Q: I removed a faulty tach sender with 3 wires that was connected to the side of my left Slick mag. How many wires are on this tach sender and will it be a simple three wire hookup to my existing wire harness to feed the rpm to my EFIS. My EFIS is set up for 2 pulses per revolution already.

This comes with a cannon plug that you would use to make a harness. The plug has 4 connectors but the wiring diagram notes that you would use only 3.