High sensitivity and easy operation,including user manual. Default cylinder setting:2,3,4,5,6,8 Universal,Works on all makes and models. Display:LCD Color Screen Working Voltage:DC 9-36V Gauge Type:RPM Gauge Measurement Range:50 to 9999RPM Frequency:20-20khz Operating temperature:0 to 50°C Size:About 50x100x75mm Signal Input: Gets signal from w terminal of the alternator; Connecting speed sensor. Fitments: Suitable for all cars,trailers,ships,excavators,construction vehicles,forklifts,etc. Colour:Black material:plastic Package Contents: 2 x Tachometer 2 x Manual Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm. Car Universal LCD 50-9999RPM Tachometer Digital Engine Tach Gauge Boat Truck Used to measure the RPM of automobile engine. Reads 50~9999RPM. LCD Color Screen with sun visor,high-definition,clear display. Accurate gauge,gets signal from w terminal of the alternator.