Agent Login
Wishlist
The HFWHOK Small Engine Tachometer is designed for chainsaws and other small engines, combining RPM measurement, engine-hour tracking, programmable alerts, and a built-in sensor wire in one compact automotive accessory.
Quick Verdict
The HFWHOK tachometer offers a broad 0–36,000 RPM range, ±10 RPM precision, fast 0.5-second refresh, and useful maintenance timers. Its four-mode logic and programmable alarm add flexibility, while the integrated sensor wire is intended to avoid loose connections and jumpy readings.
Small-engine owners who want RPM visibility plus built-in operating-hour and service tracking.
- 【Built-in Sensor Wire – No More Jumpy Readings】：Unlike detachable plug-in wires that loosen and cause erratic RPM readings, this tachometer features an integrated built-in sensor wire, soldered directly to the board for zero connection failure. Delivers rock‑stable, accurate signals even under heavy vibration on snowmobiles, motorcycles, or mowers. The 2.2m extra‑long cable offers flexible mounting anywhere on your vehicle.
- 【0–36,000 RPM & ±10 Accuracy – 4-Mode Logic】：Measures from 0 to 36,000 RPM with ±10 RPM precision and a fast 0.5s refresh rate. Smart 4‑mode logic (01/02/03/04 with 1×/2×/4× multiplier) removes guesswork – simply test at idle and pick the right mode for any 2‑stroke or 4‑stroke gasoline engine (1–8 cylinders). Timing range up to 9,999.9 hours with 0.1H accuracy.
- 【3 Timers in 1: TOT + JOB + SVC for Easy Maintenance】：Tracks TOT (total engine lifetime hours, non‑resettable), JOB (resettable task/oil‑change timer), and SVC (service countdown, default 50H, programmable 0–500H). When SVC hits zero, it's time for maintenance – no more guessing oil changes. All data is memorized; battery replacement won't erase your records.
- 【Dual‑Color Backlight & Programmable RPM Alarm】：Default green backlight ensures clear nighttime or low‑light visibility. Set your RPM alarm threshold – when exceeded, the display instantly turns red as a visual over‑speed warning. Also features MAX RPM recall to show the highest speed reached during the last run, helping prevent engine damage from over‑revving.
- 【IPX68 Waterproof, Easy Install & Universal Fit】：Rated IPX68 – fully protected against rain, snow, and high‑pressure washing. Two pickup methods: clamp the alligator clip to the spark plug wire, or use non‑contact inductive sensing (3–5cm distance). No external power needed – runs on battery with low‑charge indicator. Compatible with lawn mowers, chainsaws, ATVs, go karts, generators, tractors, outboard motors, and more. Comes with bracket, O‑rings, clip wire, and manual.
Key Takeaways
- Measures 0–36,000 RPM with ±10 RPM precision and a 0.5-second refresh rate.
- Built-in sensor wire and four-mode logic support flexible engine monitoring.
- TOT, JOB, and SVC timers help organize maintenance intervals.
RPM Monitoring
This tachometer measures engine speed from 0 to 36,000 RPM, with stated ±10 RPM precision and a 0.5-second refresh rate. Its smart four-mode logic offers 1×, 2×, and 4× multiplication options across modes 01 through 04, providing configuration flexibility for compatible small-engine applications.
Sensor and Display
The built-in sensor wire is designed to remain integrated rather than relying on a detachable plug-in lead. The product also includes a default green backlight for visibility in nighttime or low-light conditions. A programmable RPM alarm can notify users when the selected engine-speed threshold is exceeded.
Maintenance Timers
Three timer functions support ongoing maintenance: TOT records total engine lifetime hours and is non-resettable, JOB provides a resettable task or oil-change timer, and SVC works as a service countdown. Together, these functions make the tachometer more than an RPM display for routine engine-care scheduling.
Pros
- Wide 0–36,000 RPM range
- Fast 0.5-second refresh
- Built-in sensor wire
- Three maintenance timers
Cons
- Installation details are not supplied
- Compatibility guidance is limited
Buying Advice
Choose this model if your priority is combining RPM monitoring with engine-hour and service reminders. Before ordering, confirm that its four-mode logic, sensor-wire setup, and stated functions match your specific small-engine application and installation requirements.
Frequently Asked Questions
What RPM range does this tachometer measure?+
It measures from 0 to 36,000 RPM, with stated ±10 RPM precision and a 0.5-second refresh rate.
Which timers are included?+
It includes TOT for non-resettable lifetime hours, JOB for resettable task timing, and SVC for a service countdown.
