Features: 1. Cumulative total running time TOT. 2. Measure the current engine RPM. 3. The tachometer records the total running time and RPM of the gasoline engine by obtaining an induction from the spark plug cable at engine start. 4. When the engine starts, the LCD displays the current RPM; 5. When the engine stops, the LCD shows the total running time. !!Works on Any Gas Engine. Specification: 100% brand new with high quality Color: Black,orange,green,yellow,red,blue Size: 53.5*36.2*14.6mm Display Screen: LCD TOT Range: 0-99999H RPM Range: 0-30600R Easy Installation-peel&stick, no wiring necessary, or attach with enclosed hardware. Internal Battery-Connects to spark plug wire Package includes: 1 x Hour Meter 1 x Cable 2 x Screws Note: The colors may be a little different for the different monitor displays.