Notes: Due to the manual measurement, there might be some error. Sensorneed to be purchased separately. Suitable for all kinds of vehicle modification, the use of stepper motor drive pointer, accurate display engine RPM, and with the LCD display clear display hour, with instructions of high precision, repeatability and versatility, reliability and stability, drive And control is relatively simple and so on. Tachometer using stepper motor drive pointer, accurate display of the engine RPM, and with the LCD display clear display hour. Convenient Installation by multi-plug terminal connecting way. Excellent anti-fogging function. Protection grade is IP67, the whole body is completely waterproof. Name: Tachometer Tacho sensorModel : M18*1.5 Tacho Sensor M16*1.5 TachoSensor Materials: stainless steel+nickel-plated plastic Operating Current:100MA Operating Voltage: 12V/24 Indicating Range: [Please choose one that you need, when you place an order] 0-3000RPM 0-4000RPM 0-6000RPM 0-8000RPM Input Signal: Pulse Signal from tacho sensor, engine, alternator, ignition coil, crankshaft sensor, etc. Adjustable speed ratio: 1-300 Protection Class: IP67,the whole body is completely waterproof. Backlight: Red. Operation Mode: LCD Display, stepper motor. High Precision. 1 x Tachometer 1 x Owner s Manual