Tach Hour Meter, 0 to 20,000 RPM, 12-48V AC/ 6-48V DC

The tach hour meter gives you complete engine insight in one compact panel‑mount device. This digital tach hour meter measures from 0 to 20,000 RPM with ±10 accuracy, runs on 12-48V AC or 6-48V DC external power (backlight enabled), and stores runtime data permanently – helping you optimize performance and track maintenance without guesswork.

Specification

Feature

The following features make this digital hour meter a reliable choice for professional and DIY users alike:

• ±10 RPM Accuracy: This engine hour meter delivers ±10 RPM precision, letting you fine-tune idle speed and catch small engine issues early to keep peak efficiency.
• 9μA Quiescent Current: With only 9μA current draw, this hour meter for generator keeps its internal battery alive for years when the engine is off, so it is always ready.
• CMOS EEPROM Memory: Your accumulated runtime data is stored permanently even if the internal battery dies or external power fails—no resets, no lost service records, just reliable tracking.
• IP65 Waterproof Rating: Dust-tight and protected against low-pressure water jets, this rugged design withstands outdoor exposure, pressure washes, and harsh weather, making it ideal for marine, agricultural, and off-road applications.

Installation

Note: The mounting panel must have the correct mounting holes. If not, drill the corresponding holes in the appropriate positions on the panel.

1. Place the hour meter for air compressor into the mounting slot.
2. Secure the digital hour meter with two screws.
3. Referring to the image below, wrap the sensor wire around the engine’s spark plug 5 times or more, then secure it with a cable tie.

Applications

This hour meter for generator and other equipment supports all 4-stroke gasoline engines, including motorcycles, boats, lawn mowers, generators, ATVs, and snowmobiles. It offers four adjustable ignition modes (1P1R, 2P1R, 1P2R, 3P1R) to match different engine cylinder configurations. Whether you need a programmable hour meter for saltwater conditions or a rugged rpm gauge for mowers, this device delivers accurate readings in any environment.

FAQ

• How do I know if this tach hour meter works with my engine?
  This hour run meter is designed for 4-stroke gasoline engines only. It supports four ignition modes (1P1R, 2P1R, 1P2R, 3P1R) and works with most small engines on motorcycles, lawn mowers, boats, tractors, and generators. If your engine is a 4-stroke and has a spark plug, this programmable hour meter will likely work.
• Does the backlight stay on all the time?
  No. The backlit LCD only activates when external power (AC 12-48V or DC 6-48V) is connected AND an ignition signal is present. Without external power, the waterproof hour meter runs on its internal CR2032 battery, and the backlight will not turn on – this preserves battery life.
• What happens if the internal battery dies?
  The internal CR2032 battery powers the hour run meter when external power is absent. If it dies, the CMOS EEPROM memory retains all accumulated runtime data permanently. Simply replace the battery, and your run time meter will display the original total hours – no data loss.