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 Water Oil Temperature Gauge,Alert RPM & Temp,Backlights Display for Lawn Tractor Compressor Generator Snowmobile Marine Jet Ski Pit Bike (RL-HM035A-TS001)

Runleader Digital Tach Hour Meter,Engine Water Oil Temperature Gauge,Alert RPM & Temp,Backlights Display for Lawn Tractor Compressor Generator Snowmobile Marine Jet Ski Pit Bike (RL-HM035A-TS001)

Product ID: 448748324

Details

Brand
Runleader
Item weight
60 Grams
Material
Plastic Glass
Number of Items
1
Unit count
1 Count

⏱️Tracks up to 999.99 hours total & job time

⚙️RPM range 0-25,000 with real-time & max recall

🌡️Temp sensor covers -20°C to 300°C with alerts

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฿4560

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Sold byAmazon ThailandDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

⚡ Stay ahead of engine wear with smart alerts and precision tracking!

RUGGED READY - Waterproof IP67 design with shock resistance and easy installation keeps your gear protected in any environment.
DYNAMIC RPM TRACKING - Real-time RPM display with programmable alerts ensures you never push your engine beyond safe limits.
ADAPTIVE BACKLIGHT SYSTEM - Green for normal use, red flashes for alerts—perfect visibility day or night without distraction.
PRECISION ENGINE MONITORING - Accurately logs total and session hours to optimize maintenance timing and extend engine life.
COMPREHENSIVE TEMPERATURE CONTROL - Monitors oil, water, and coolant temps with instant alerts to prevent overheating and costly damage.

The Runleader RL-HM035A is a compact, waterproof digital tachometer and hour meter designed for gas engines across lawn tractors, generators, marine, and more. It tracks total and job hours up to 999.99 with programmable maintenance intervals, measures RPM up to 25,000 with alert functions, and monitors engine temperature via a probe sensor with overheat warnings. Featuring a versatile backlight system and durable IP67-rated housing, it ensures reliable, real-time engine health monitoring to maximize performance and prevent downtime.

Specifications

ASIN	B0B24FFJMQ
Best Sellers Rank	#206,617 in Automotive ( See Top 100 in Automotive ) #74 in Automotive Tachometers
Brand Name	Runleader
Customer Reviews	4.1 4.1 out of 5 stars (32)
Item Weight	60 Grams
Manufacturer	Ningbo Jiangbei Run Leader Electronics Co., Ltd
Material Type	Plastic Glass Metal
Model	RL-HM035A-TS001
Part Number	HM035A
Unit Count	1 Count

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