How do you connect it to read engine temperature?

Remove the spark plug. Place the copper washer over the threaded portion of the plug and screw the plug back into the cylinder head. Tighten the plug with the appropriate torque.

Does this work with 2-cylinder engines, or just singles?

It works with: 2 stroke: 1 cylinder / 2cylinder / 3cylinder 4stroke:1 cylinder / 2cylinder / 3cylinder / 4cylinder / 5cylinder / 6cylinder / 8cylinder /12cylinder/16cylinder 6 stroke:2 cylinder Some 4 stroke 1 cylinder engine is 1P1R,the setting is the same way as the 2 stroke 1 cylinder engine.

How long are the wires on the temperature sensor ring cables? Only the length of the tach wire is shown.

The length of probe sensor wire is 58.5cm(approx.23.03 inches)

How do I know which model to get? The connections look different.

we think your model is HM035A-TS003, the temp sensor can measure the engine temperature especially easy to put it into engine radiator.

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Runleader Digital Tach Hour Meter Engine Temperature Gauge RL-HM035A-TS002

Product ID: 318290599

Details

Brand
Runleader
Item Weight
60 g
Item dimensions L x W x H
1.46 inches
Material
Plastic

⏱️Tracks up to 999.99 hours total & job time

⚙️Real-time RPM up to 25,000 with alert

🌡️Engine temp range -20°C to 300°C with max temp alert

€ 47.67

Duties & taxes included

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Description

⚡ Stay ahead of engine wear with smart monitoring that means business!

ADAPTIVE BACKLIGHT MODES - Green and red backlights with automatic, always-on, or manual modes for optimal visibility day or night.
ROBUST EASY INSTALLATION - Water and shock-resistant design with versatile mounting options and simple one-wire spark plug connection.
DYNAMIC RPM MONITORING ALERTS - Real-time RPM display with customizable alert thresholds to prevent engine over-revving.
PRECISION ENGINE RUNTIME TRACKING - Monitor total and job hours with programmable previous hours for flawless maintenance scheduling.
COMPREHENSIVE TEMPERATURE SURVEILLANCE - Keep your engine safe with continuous temperature readouts and high-temp warnings in °C or °F.

The Runleader RL-HM035A-TS002 is a compact, durable digital tachometer and hour meter designed for professional-grade engine monitoring. It tracks total and job-specific run hours, measures RPM up to 25,000 with alert capabilities, and monitors engine temperature from -20°C to 300°C. Featuring customizable backlight modes and easy installation, it’s ideal for lawn tractors, generators, marine vehicles, and more—ensuring timely maintenance and peak engine performance.

Specifications

ASIN	B092CDSQ33
Best Sellers Rank	#17,583 in Automotive ( See Top 100 in Automotive ) #4 in Automotive Tachometers
Brand Name	Runleader
Customer Reviews	4.0 4.0 out of 5 stars (1,027)
Item Dimensions	1.46 inches
Item Highlight	Alert RPM & Temp,Backlights Display,For Lawn Tractor Compressor Generator,For Snowmobile Marine Jet Ski,For Pit Bike
Item Weight	60 g
Manufacturer	Ningbo Jiangbei Run Leader Electronics Co., Ltd
Material Type	Plastic
Model	RL-HM035A
Number of Items	1
Part Number	RL-HM035A
Thread Style	Spark Plug Wire Wrap (One-wire)
UPC	723093900728

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TrustScore 4.5 | 7,300+ reviews

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