I bet it works. The tach doesn't care how many cylinders you have. It is based on the pulse from the stator. Here is the description from that link:
Description:
Inductive Hour Meter was powered by the built in changeable battery.
Easy to Install the digital memory tachometer.
Large LCD display for easy reading.
Waterproof Inductive Hour Meter Suitable for all 2 Stroke & 4 Stroke gasoline engines
Tachometer and Engine Hour Meter show both engine RPM and hours of operation


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