UMA Electronic 3-1/8 TSO'd Tachometer

From $584.00 to $599.00
Description Part Number Price Buy
UMA 3-1/8" ELECTRIC TACHOMETER 0-3500 RPM 500-2700 GRN 2700 RL
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Owners of Lycoming and Continental powered airplanes now have an electronic, analog alternative to the old cable driven tachometer. The new UMA tach is certified to FAA TSO C49b standards for fixed wing aircraft. The system uses a tach sender mounted on the engine in place of the mechanical cable and is connected to the indicator with a single, 3-conductor cable.

The 3 1/8 indicator utilizes a high torque pivot and jewel movement. The hour meter can be factory set to start at any desired RPM point. This unit gives the pilot the analog display that is easiest to scan and provides electronic accuracy and ease of installation. Custom dial markings in color and internal Electro-Luminescent lighting are available at extra cost.

Comes with T1A3-4 Sending Unit and 1D6 Harness
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After several years of trying to get a mechanical recording tachometer to work in my Stearman, I chose this UMA tach. Manufacturer will set desired RPM when recording starts, and they mark tachometer limits. They even placed a Stearman logo on the face of the tach. The accumulated time is small and difficult to read, but I typically look at it only during annual and for ail changes. Straightforward installation. Great technical support. Tachometer works very and is worth every penny.

Thomas S
July 7, 2024

Inaebnit Verified Purchase


April 2, 2024

I purchased this tach approximately June 24. The tach did not work immediately after installation. I still do not have a working tach. I still cannot fly my airplane. I never felt like anyone wanted to resolve this issue. I felt Aircraft Spruce should hav e immediately sent a replacement.

Doug L Verified Purchase

UMA 3-1/8" ELECTRIC TACHOMETER 0-3500 RPM 500-2700 GRN 2700 RL

July 9, 2021

Unbelieable ! This tach works perfectly and so easy to install on my PA 32. Welcome to the 21 century -)

March 13, 2020

Very nice unit to replace a mechanical installation. Less weight, no long tach cable, easy to install. Used on a small bi-plane that had a very long tach cable to reach the rear pit.

November 8, 2018

Purchased for a Continental 0-300. The original generator had been updated to a 60-Amp alternator. Unfortunately, the mechanical tach electronic pickup doesnt fit on the engine because of the increased radius of the alternator from the OEM generator, so we will have to return the tach. Had it fit, it would have been perfect for our Cessna 170b.

Chas M
May 2, 2023

It is nice to ditch the failure prone mechanical tach cable and yet not give up the analog needle. The TSOd version must be set up exactly to POH or engine STC. The owner does have some discretion, they choose the RPM the hour meter starts counting. Think carefully about that fact. Ive seen this tach in rental airplanes where the hobbs is double tach time. My only complaint, the hour meter is to small and hard to read, otherwise it would be 5 stars.

Stan S
December 15, 2020

Nice looking and easy to install. It requires aircraft power to work, so do not try to use this on your J-3 or any aircraft with no electric system. I am surprised the FAA allowed this to be TSOd as most tachs should be able to work when there is an electric power failure. Ultimately this should have a tach generator power source for safety.

Farnworth A Verified Purchase

UMA 3-1/8" ELECTRIC TACHOMETER 0-3500 RPM 500-2700 GRN 2700 RL

August 26, 2022

Bought UMA 3-1/8 ELECTRIC TACH 0-3500 RPM W/ SENDER 6 TSO. It works realy fine. But there was a problem with wiring: there was no power at the sending unit. So I had open the Tachometer housing and solder a bridge between pin 2 and 3

Paul S
July 19, 2018


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 I install this tach in my certified aircraft with a simple logbook entry or does it need a field approval?

This product is certified (TSO'd) but you will still need to send in a 337 field approval referencing the TSO. If you have the exact same model number in the panel and you are replacing it a simple lookbook entry will work. Always consult your installer as each FAA FSDO may rule differently.

Q: What does 6 in the sending unit name mean(UMA TACH PICK UP FOR BENDIX MAG 6 LEAD)? Is this sending unit included into the UMA 3-1/8 ELECTRIC TACH 0-3500 RPM W/ SENDER 6 TSO(10-01221)? What is difference between 10-01221 and 10-01222?

6 in the name UMA TACH PICK UP FOR BENDIX MAG 6 LEAD means 6 ft lead. It refers to the length of the lead. Yes, the sender is included with 10-01221. Difference between 10-01221 and 10-01222 is that 10-01221 does not include range markings and 10-01222 does include range markings. The range markings for 10-01222 are GREEN ARC 500-2700, RED LINE 2700 RPM.

Q: Are there any 2-1/4 Electric Tachometers avalible?

While there are a few such as PN: 10-02140, please not that they are for experimental aircraft and are not TSO'd.

Q: I'd like to know if PN: 10-01222 UMA Electronic 3-1/8 Tachometer will interface directly with a Lightspeed Plasma III unit?

This would be UMA PN:T19-801-112 and Per UMA, this Tachometer would work with the Plasma III.

Q: Is the hours counter resettable to the current aircraft hours as in mechanical tachometers. Is the replacement of a mechanical tach in a certified aircraft considered a minor alteration by the FAA?

Yes, indicate current hours on the order to have hobbs meter set to engine time. This will only be a minor alteration if the tach you are installing the same model of the one you are replacing.

Q: Does this UMA tachometer (part number 10-00120) come with the sending unit?

Yes, this product includes the sender that screws into the tach drive.

Q: Do I need special approval to install this UMA TSO'd tachometer into my Canadian registered certified aircraft?

This unit has a FAA TSO approval. However, you will need to contact your local aviation authority office to see what their ruling on installing a FAA TSO'd unit into your aircraft.

Q: Can the lead for the UMA electric tach be ordered longer than 6 feet?

Yes, please contact our sales department for pricing and lead time on this special order.

Q: What is the difference between 10-00120 and 10-02116?

10-02116 is specifically for 6 cylinder engines and has a different sender.

Q: How is the rpm value for recording set? Is it set by customer or does it have to be preset at factory?

The standard is 1800, however the manufacturer can change this if required.

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