A1Choice&reg; Hour Meter & Tachometer UNIVERSAL Digital RPM Gauge Back-light Display for - ATV Dirt Bike Outboard Yamaha Honda KTM Polaris Engines Generators Boats Motorcycles Scooters A1Choice Tachometers come with built in O-ring for superior water resistance Displays Engine RPM & Records Total Engine Run Time (Battery Included) Excellent for maintenance schedules such as Dirt Bikes Go-karts- Marine Engines - Motorcycles - Lawn Mowers - Small and Large Engines Large LCD display with back-light.