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Tiny-Tach Model TT2A

14 Reviews 11 Answered Questions
$73.53/Each
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Part# 10-04182
MFR Model# TT-2A

Overview

  • RPM reading adjustable from 1 spark per 2 revolutions to 8 sparks per revolution. One TINY-TACH™ now works for most gas engines.
  • RPM display from 1 to 19,000.
  • RPM update time 1/2 second.
  • Hour meter records total actual running time on your engine.
  • Job timer can be reset to record run time for record keeping.
  • Coax cable transmits signal without EMF interference.
  • 1 Antenna cable winds around your spark plug wire to give you the RPM reading – clean and simple to attach. Signal strength can be controlled by the antenna wire.
  • Standard cable length is 6 feet. If additional length is required, contact sales for special order.
  • TINY-TACH™ unit is potted to prevent damage from moisture and vibration. Lithium battery life 5+ years, not replaceable.

NOTE: Some engines, such as multi-cylinder outboards generate considerable electronic "noise" and may require a light filter to assure a clear RPM reading. You will find a "comments" section at the end of the order page where you can tell us about your engine – what kind and how many cylinders it has – so that we can make any necessary adjustments.

One year warranty

Note: This will not work with a shielded ignition harness or lead.

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Reviews

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Loved this little tach. Easy to read located just below my MGL COLOR AIRSPEED INDICATOR/VSI (BLAZE SERIES) and with the compass next to it I have all the info I need for my ultralight flying.

Robert C Verified Purchase

Tiny Tachometer Model TT2A
September 23, 2024

Richard C Verified Purchase

Tiny Tachometer Model TT2A
April 13, 2022

Worked very well- fast shipping. Wound highly recommend to others Thanks R. B.

Richard B
June 2, 2020

Great product

Darryl K
May 11, 2020

Replacement for my old Tiny Tach. Battery finally gave out. 5 yrs old.

Steve J
September 28, 2019

The battery in my first Tiny Tach lasted from 1998 until 2015. Results may vary.

Alex W
November 5, 2016

A terrific little powerhouse of a device. I used mine to help troubleshoot issues with tach indications on my OpenFlight EFIS from a Rotax 912 UL. Great for that usage, since it measures RPM in a completely different manner. The unit I received from Spruce [special order, with a longer antenna wire] was defective. Fantastic support from the manufacturer, who helped me troubleshoot and ultimately shipped me a new unit free or charge. GREAT EXPERIENCE.

Drew H
May 7, 2024

My Tiny Tach on my Starflight Ultralight with a Rotax 377 just died due to battery failure. It has been on the craft for about 20 years and until today was working great. I am disappointed that the battery is not replaceable (anyone know a hack?) but otherwise have been very happy with it and will replace it with the same.

Bob F
April 4, 2019

My tach has been in service for 4 years now and its still working well. I have a Lyc TIO540AF1B. We did have to cut a small opening in the shielding and then wound 10 turns over that opening (instructions recommended 3). It hasnt missed a beat since. Beats an optical tach as they dont work at night.

Carl B
May 18, 2018

These are good, but they are not permanent hourmeters for your wings. They have an internal battery, which is replaceable with a standard 2032 watch coin battery. There are you-tube videos that explain how to replace the battery. It is not difficult I just did two. The trouble is that as soon as your TinyTach gets down to maybe one-quarter volt on its battery, it shuts off and loses accumulated time. I found out the hard way. I put two on my plane when I built it 5 years ago for redundancy and they both failed at about the same elapsed calendar time. They were reading +- 2 hours engine time when they failed, so that was good. They are definitely easy to install and good for the first few years of your planes life, but they are not permanent hourmeters. On repowering, they reset to zero hours. I also installed a Honeywell hourmeter but it broke so I relied on the Tiny-Tachs. If there is a way to reset accumulated time on a re-power event, they would be great. I am looking for that now. Otherwise, plan on investing in a permanent hourmeter that wont reset on power loss. 3 stars for price and easy to install and reliable as long as the battery is fresh. Dont see a way to repower with internal or external battery without resetting. That is a drawback.

Phill S
September 4, 2025

Q&A

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Please note, Aircraft Spruce Australia'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 Australia 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: What model of Tiny Tach would work on a Lycoming 235 with magnetos and read accurately?

Part number 10-04182 is a universal unit and can be programmed for your Lycoming engine.

Q: Does this Tiny Tach Model TT2A come with a TSO approval?

No, this unit is not FAA TSO approved

Q: I understand the 10-4182 will work on the Lycoming engines.. will it count off the P-lead connection with proper resistive de-coupling? We don't wish to cut the shield on new plug wires. Is this your best choice for 1- self powered 2- Total tine counting 3- Tach Thank you frank

The manufacturer does not recommend connecting to the P-lead. You must cut back the shield on the plug wires in order for this device to work properly.

Q: Will the Tiny-Tach TT2A work on a Rotax 503 motor?

Yes, it will.

Q: Is the one you sale looks just like this one?

Yes, the photo is representative of the unit for sale.

Q: Is it possible to extend the wire, if yes, what will be the procedure?

This comes standard with a 6 ft lead. Longer leads are available but they are special order. Please contact our sales department for pricing and lead time of a custom length lead on the TT2A.

Q: What is the Tiny Tach TT2A setting for the 503 spark per revolution?

You will want to set the Tiny Tach to 2 sparks per revolution.

Q: How many wires to run it? The last tach for a Rotax 912 was 3-wire. Somehow it broke it before it ever would work.

This has two wires. One goes around a spark plug wire and the other grounds to the engine.

Q: Can add to the sender wire with a splice?

No, however you can special order the tiny tach with a custom length cable. Please contact our sales team for custom quote.

Q: Will this work on a Rotax 532 engine?

It should as long as the ignition harness isn't shielded.

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