Review on Runleader Backlight Hour Meter Tachometer: Maintenance Reminder for Lawn Mower, Tractor, Generator, Marine Outboard, ATV, Motor, Snowmobile & Gas Powered Equipment - Battery Replaceable, User Shutdown by Bennie Wilks

Great tach for the money. Super easy installation - just wrap a wire 5 times around the spark plug wire. Seems accurate and easy to use. The Ruckus is a single cylinder four stroke engine and should have been tuned to 1P2R but it was too high. So I went back to the default 1P1R and works great. It's actually a tuning tool, not a constant checking tool, as you can't see it at night - you have to press a button to make it glow. Not a big deal, but be aware.