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 | Alert RPM & Temp,Backlights Display,For Lawn Tractor Compressor Generator,For Snowmobile Marine Jet Ski,For Pit Bike

Runleader Digital Tach Hour Meter Engine Temperature Gauge RL-HM035A-TS002 | Alert RPM & Temp,Backlights Display,For Lawn Tractor Compressor Generator,For Snowmobile Marine Jet Ski,For Pit Bike

Product ID: 318290599

Details

Brand
Runleader
Item Weight
60 Grams
Item dimensions L x W x H
1.46 inches
Material
Plastic
Number of Items
1

⏱️0-999.99 hrs TOT & JOB tracking

⚙️0-25,000 RPM real-time readout

🌡️-20°C to 300°C engine temp monitoring

₩78865

Duties & taxes included

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Sold byAmazon South KoreaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

⚡ Stay Ahead of Engine Wear with Smart Alerts & Precision Tracking!

ADAPTIVE BACKLIGHT DISPLAY - Green backlight for night use with automatic, always-on, or off modes plus red alert backlight for critical RPM or temp warnings.
DYNAMIC RPM MONITORING ALERTS - Real-time RPM display up to 25,000 with customizable alert thresholds to prevent engine over-revving.
UNIVERSAL DURABLE INSTALLATION - One-wire spark plug connection with flexible wiring length, water and shock resistant design, perfect for lawn tractors to marine jet skis.
ADVANCED TEMPERATURE SURVEILLANCE - Keep your engine safe with continuous temperature readouts and alerts from -20°C to 300°C, switchable between °C/°F.
PRECISION ENGINE RUNTIME TRACKING - Monitor total and job-specific hours with programmable previous hour input for flawless maintenance scheduling.

The Runleader RL-HM035A-TS002 is a versatile digital tachometer and hour meter designed for gas engines across multiple applications including lawn tractors, compressors, generators, snowmobiles, marine jet skis, and pit bikes. It features precise runtime tracking up to 999.99 hours, real-time RPM monitoring up to 25,000 RPM with alert functions, and engine temperature measurement from -20°C to 300°C. The device includes customizable backlighting for optimal visibility and durable, water-resistant construction for reliable performance in diverse environments.

Specifications

ASIN	B092CDSQ33
Best Sellers Rank	#15,151 in Automotive ( See Top 100 in Automotive ) #4 in Automotive Tachometers
Brand Name	Runleader
Customer Reviews	4.0 4.0 out of 5 stars (1,229)
Item Dimensions	1.46 inches
Item Weight	60 Grams
Manufacturer	Ningbo Jiangbei Run Leader Electronics Co., Ltd
Material Type	Plastic
Model	RL-HM035A
Part Number	RL-HM035A
Thread Style	Spark Plug Wire Wrap (One-wire)
UPC	723093900728

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