Runleader Digital Tachometer Hour Meter & Engine Temp Gauge RL-HM035A-M5 — 0–25,000 RPM, Programmable Alerts

The Runleader RL-HM035A-M5 is a combined digital tachometer, hour meter and engine temperature gauge built to track RPM, record running hours and monitor engine temperature with programmable alerts.

This compact instrument combines three essential engine-monitoring tools in one waterproof, vibration-resistant housing. It displays total runtime and single-job hours, measures real-time and peak RPM, and reads engine temperature via a probe sensor. The unit supports user-set alert thresholds and selectable backlight modes so you can spot over-revving or overheating at a glance.

How does this device track engine operating hours?

The RL-HM035A-M5 records both cumulative total hours and individual job hours so you can separate overall service life from specific runs. You can program an initial hours value when replacing the unit, and a service (SVC) reminder counts down from a set interval.

• Displays TOT (total) and JOB (single run) hours up to 99999 hours.
• Programmable INT to set previous hours during replacements.
• SVC timer can be set from 5 to 1000 hours for maintenance reminders.

What RPM information does it provide and how accurate is it?

The meter shows real-time revolutions per minute and stores the highest RPM reached during an engine session. Multiple ignition/firing pattern settings let the unit adapt to different engine configurations and deliver RPM readings up to 25,000 RPM.

• Real-time RPM readout with highest-revolution memory since start.
• Works across varied engine firing patterns with adjustable settings.
• RPM measurement range 0–25,000 RPM; user alert range 100–25,000 RPM.

Can it monitor temperature and warn me about overheating?

Temperature is measured by the included probe, showing both current and maximum recorded values. You can choose Celsius or Fahrenheit and set an alert threshold so the display signals when the engine exceeds your safety margin.

• Probe measures -20°C to +300°C (-4°F to +572°F).
• Displays current and peak temperature readings for session monitoring.
• User-defined temperature alert to notify when limits are exceeded.

What mounting, display and durability features should I expect?

The unit offers multiple mounting options and a configurable backlight to suit daytime or nighttime use. It’s designed for outdoor engines with water and shock resistance, a replaceable battery, and simple wiring using a single lead from the spark plug for RPM sensing.

• Mount with adhesive, screws or optional bracket (bracket not included).
• Green default backlight with auto, always-on or off modes; red backlight for alert conditions.
• 68.8-inch spark-plug signal lead supplied; battery protected during shipping and replaceable.
• Water- and shock-resistant construction and LCD shutdown to save power.

Who is this for: The Runleader RL-HM035A-M5 is aimed at owners and technicians of small gas engines—generators, water pumps, lawn equipment, compact construction machines and other single-cylinder engines—who need an integrated, durable instrument to monitor runtime, RPM behavior and engine temperature. Its programmable service reminders and alerting backlight make it practical for routine maintenance schedules and quick fault detection in both professional and home-use settings.