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Trail Tech TTO Tach/Hour Meter (742-A00)

Updated June 26, 2026

The Trail Tech TTO Tach/Hour Meter (part number 742-A00) is a compact digital gauge that combines a tachometer and a non-resettable hour meter. Designed for all gasoline engines, it is commonly used on motorcycles, ATVs, UTVs, snowmobiles, and other powersports vehicles to monitor engine RPM and track total running hours for maintenance scheduling.

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How It Works & Key Features

The TTO uses a single wire that wraps around a spark plug lead to detect ignition pulses, allowing it to measure engine RPM from 0 to 19,999 and accumulate running hours up to 99,999. It features a large, easy-to-read digital display with adjustable update speed (fast/slow) and spark sensitivity (high/low) to suppress electrical noise on modern fuel-injected engines. An internal battery powers the unit, so no connection to the vehicle's electrical system is required. The meter also includes a wrench icon that alerts the user when a preset service interval is reached.

Vehicle Compatibility & Fitment

While the TTO is universal and works on any gasoline engine, it is particularly popular on off-road motorcycles and ATVs. Listing data shows direct fitment for a wide range of KTM models (e.g., 250 XC-W TPI 2018-2022, 250 SX-F 2005-2022, 65 SX 2023-2025), Honda CR500R and XR200R models from the 1980s and 1990s, and Arctic Cat Alterra 600 models. Its compact size (50 x 25 x 14 mm) and surface-mount design make it easy to install on handlebars, frames, or any flat surface.

Installation Notes

Installation is straightforward: wrap the included pickup wire around the spark plug wire (one to two turns), then mount the gauge using either the supplied bolt-on screw caps (screws not included) or the peel-and-stick adhesive backing. No wiring to the battery or ignition system is needed because the unit runs on its internal battery. The meter can be placed anywhere convenient, such as on the handlebar, top clamp, or frame. Ensure the pickup wire is not near other high-voltage components to avoid false readings.

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KTM 250 XC-W TPI 2018-2022. KTM 250 XC-W 2006-2018. KTM 250 XC-F 2007-2022. KTM 250 XC TPI 2020-2022. KTM 250 XC 2006-2019. KTM 250 SX-F 2005-2022. KTM 250 SX 1992-2023. KTM 250 MXC 1984-1988, 1996-2003.

$50.41Free ship
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United States·parts_giant99.8%(730,508)
Est. Jun 29–Jul 1
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New design front button TTO is a digital tachometer and hour meter that works on all gasoline engines. The number of hours an engine has been running is critical to its maintenance schedule. Attach one to your motorcycle or ATV and be aware of upcoming service requirements. Tachometer from 0 - 19999 RPM. Non-resettable hour meter from 0 - 99999 hours. Easily mount it to any surface using either the bolt-on (screw caps included, screws NOT included) or peel-and-stick mounting options. Max RPM features.

$56.32Free ship
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United States·motosportinc99.9%(66,505)
Est. Jun 29–Jul 2
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Easily mount it to any surface using either the bolt-on (Screws not included) or peel-n-stick mounting options. WIDTH50 Mm. PART TYPEElectrical & Lighting. MANUFACTURER PART NUMBER742-A00. HEIGHT25 Mm.

$65.22Free ship
United States·shopmotomentum99.7%(535,121)
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$49.95Free ship
United States·atvunlimited99.7%(211,737)
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99,999 Hour Digital Display. Works on all gas engines (including newer fuel injected four cycle engines). Adjustable settings for Fast/Slow updates, Hi/low spark sensitivity (for electrical noise suppression).

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United States·cascade_lakes_motorsports99.8%(231,874)
Est. Jun 30–Jul 3
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Motorcycle & Scooter Parts & Accessories

The TTO Digital Tach/Hour Gauge with Maintenance is full of features. Large readable display allows you to easily monitor your engine's running hours up to 99,999 total hours ensuring that you perform proper maintenance on your engine.

$54.95Free ship
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United States·shopmx1west99.9%(84,446)
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Trail Tech part number 742-A00.

$85.00Free ship
United States·moto_stuff100.0%(896)
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New Products. Great guy. The product I ordered is perfect exactly what I expected. The price was great. I will buy from these people again.

$54.95+$8.99 ship= $63.94
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United States·horner_powersports99.9%(14,236)
Est. Jun 29–Jul 1
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We are an authorized Trail Tech dealer. Housing Color Black. Readout Color Black. Hours of Operation. Easily mount it to any surface using either the bolt-on (screws not included) or peel-n-stick mounting options.

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United States·motorcycleworks99.6%(180,305)
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Surface mount: easily mount it to any surface using either the bolt-on (screws not included) or peel-n-stick mounting options. ARCTIC CAT Alterra 600 Black Hills Edition 2023–2024. KTM 65 SX 2023–2025.

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United States·vitvov99.7%(16,727)
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Weight0.15 lbs.

$54.95+$7.99 ship= $62.94
United States·shopdenniskirk99.8%(115,395)
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(2) Black plastic plugs.

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United States·bidby100.0%(40,866)
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$54.95+$8.95 ship= $63.90
United States·moto-manracing100.0%(44,825)
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Trail Tech products are designed by industry leading engineers and supported by a dedicated staff. Trail Tech will continue to invent and develop cutting edge, quality products for the benefit of the Powersport community.

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United States·leclarepowersports100.0%(75,469)
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1999 Honda CR500R. 1998 Honda CR500R. 1988 Honda CR500R. 1987 Honda CR500R. 1986 Honda CR500R. 1985 Honda CR500R. 1984 Honda CR500R. 1983 Honda XR200R.

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United States·bikes_trikes_and_quads99.8%(38,064)
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Up for sale is TRAIL TECH 2005-2017 CRF450X Honda TTO TACH HOUR METER BLACK. The vendor part number is 742-A00. Please read the title to know what is for sale TTO is the smallest available meter at 50x25x14mm and has large, easy to read digits. Easily mount it to any surface using either the bolt-on (Screws not included) or peel-n-stick mounting options. TTO digital tach/hour meter will work on any gasoline engine This little gauge provides several useful features including a tachometer, a non-resettable hour meter, a resettable hour meter for maintenance, and a clock There is an internal battery so there is no need to connect to power Simply wrap a single wire around your spark plug and mount it wherever you desire

$74.77Free ship
United States·mxstuf4u100.0%(36,979)
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CONTAINS: PROP 65. This product may contain chemicals known to the State of California to cause cancer, birth defects, or reproductive harm. Warning for California residents. WIDTH0.98". DEPTH0.55".

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United States·shopmotomentum99.7%(535,121)
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The number of hours an engine has been running is critical to its maintenance schedule. Surface mount: easily mount it to any surface using either the bolt-on (screws not included) or peel-n-stick mounting options.

$58.24Free ship
United States·universal_powersports99.5%(36,726)
Est. Jun 29–Jul 1
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Easily mount it to any surface using either the bolt-on (Screws not included) or peel-n-stick mounting options. Simply wrap a single wire around your spark plug and mount it wherever you desire. There is an internal battery so there is no need to connect to power.

$62.38Free ship
United States·mojomotosport99.9%(4,135)
Est. Jun 29–Jul 1
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Attach one to a motorcycle, ATV or lawn-mower and be aware of upcoming service requirements Tachometer from 0-19,999 rpm Non-resetable hour meter from 0-99,999 hours Easily mount it to any surface using either the bolt-on (screws not included) or peel-n-stick mounting options "Wrench Icon" with hours The smallest available meter at 50 x 25 x 14mm and has large, easy to read digits .

$59.50Free ship
United States·ridersaddiction99.7%(99,138)
Est. Jun 30–Jul 7
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TTO is the smallest available meter at 50x25x14mm and has large, easy to read digits. Easily mount it to any surface using either the bolt-on (Screws not included) or peel-n-stick mounting options. Features: TTO digital tach/hour meter will work on any gasoline engine This little gauge provides several useful features including a tachometer, a non-resettable hour meter, a resettable hour meter for maintenance, and a clock There is an internal battery so there is no need to connect to power Simply wrap a single wire around your spark plug and mount it wherever you desire

$63.94Free ship
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United States·hnr_powersports_llc99.9%(33,246)
Est. Jun 30–Jul 3
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Attach one to a motorcycle, ATV or lawn-mower and be aware of upcoming service requirements Tachometer from 0-19,999 rpm Non-resettable hour meter from 0-99,999 hours Easily mount it to any surface using either the bolt-on (screws not included) or peel-n-stick mounting options "Wrench Icon" with hours The smallest available meter at 50 x 25 x 14mm and has large, easy to read digits .

$53.74Free ship
-8%$4.51
United States·perf-moto99.8%(221,342)
Est. Jun 30–Jul 3
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Adjustable tach pulse sensitivity (high/low). Adjustable display update smoothness (fast/slow). Spinning arrow activity icon.

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United States·idaily99.9%(37,896)
Est. Jun 29–Jul 2
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Works on all gas engines (including fuel injected 4-cycl engines. Spinning arrow activity icon. Adjustable display update smoothness (fast/slow). Adjustable tach pulse sensitivity (high/low). ).

$63.93Free ship
United States·powersportsuperstore99.1%(183,052)
Est. Jun 29–Jul 1
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Frequently asked questions

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Does the Trail Tech TTO work on fuel-injected engines?

Yes, it works on all gasoline engines, including modern fuel-injected four-stroke engines. The adjustable spark sensitivity helps suppress electrical noise from fuel injection systems.

How is the TTO powered? Does it need to be wired to the battery?

No wiring to the vehicle's electrical system is required. The TTO has an internal battery that powers the display and hour meter, so it is completely self-contained.

Can the hour meter be reset?

No, the hour meter is non-resettable. It accumulates total engine running hours from 0 to 99,999 to provide an accurate record for maintenance tracking.

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