Why does this only work for 2 cylinders?

It works in three modes for the spark 1P1R (1 pulse of electric power thru the plug wire for every 1 revolution of the crank) ie… a two stroke motor, fires on every crank revolution… 1P2R (1 pulse of electric power thru the plug wire for every 2 rotations of the crankshaft) ie… a four stroke engine… and… 2P1R (2 pulses of electric power thru the plug wire for every 1 rotation of the crankshaft) ie… multi -spark ignition (usually CDI ignitions that require a battery to operate) 2 stroke… lastly, the hour meter doesn’t care how many rpm or strokes or pulses, it is just a cumulative timer of how long the tach has been receiving a spark signals off of the plug wire… number of cylinders doesn’t matter because all internal combustion engines will fire all cylinders in either 1 (2 strokes) or 2 (4 stroke) rotations of the crank shaft no matter what the layout is (radial, inline, V, horizontal opposing)…

Hour/ tach meter recommendations for a 3 cylinder motor?

You need the HR-8062-2 model, up to 8 cylinder engines..

How is this one-wire tach different from others that have black, red & black wires? I want to use one to tune a mower, tiller & chainsaw.

Just wrap the wire around the spark plug wire and that’s it, this tach comes with instructions how to calibrate it for one or two cylinders.

I purchased this. says for 4 stroke engines.has to be attached near coil. i cant to that. will it still work on my champion 3500 generator?

Yes I have one on my champion generator works great

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⏳ Stay ahead of downtime with precision hour tracking!

UNIVERSAL COMPATIBILITY - Works seamlessly with any gas engine up to 2 cylinders & fuel injection
10 YEAR SEALED BATTERY LIFE - Long-lasting power with no external wiring or charging needed
BUILT TO BRAVE THE ELEMENTS - Epoxy encapsulated, water-resistant casing ensures durability outdoors
DUAL FUNCTION HOUR TACH METER - Monitor total engine hours and real-time RPM for smarter maintenance
EFFORTLESS ONE WIRE INSTALLATION - Get up and running in minutes with patented simple hookup

The Hardline Products USA Hour/Tach Meter is a compact, water-resistant device designed to track total engine hours and RPMs up to 16,000 on gas engines with up to two cylinders. Featuring easy one-wire installation and a 10-year sealed lithium-ion battery, it supports fuel-injected engines and is ideal for motorcycles, ATVs, marine craft, and small engines. Made in the USA, it empowers proactive maintenance to extend your machine’s life and performance.

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Brand	Hardline Products
Material	Plastic
Item dimensions L x W x H	1 x 5 x 8 inches
Item Weight	1.76 ounces
Screen Size	5 Inches
UPC	632194080614 182682908543 632195000000 632194806122
Global Trade Identification Number	00632194806122
Manufacturer	Hardline Products
Model	Hardline Products HR-8061-2
Product Dimensions	1 x 5 x 8 inches
Item model number	HR-8061-2
Batteries	1 Lithium Ion batteries required. (included)
Is Discontinued By Manufacturer	No
Exterior	Painted
Manufacturer Part Number	HR-8061-2
OEM Part Number	HR-8061-2

Hardline Products USA Hour Meter (Hour/Tach Meter)

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