Features： 1、Suitable for all kinds of vehicle modification, using a stepper motor to drive the pointer, accurately display the engine speed, and has a clear LCD display. 2、It has the characteristics of high indication accuracy, versatility, high reliability and stability, and relatively simple control. 3、IP67 waterproof and dustproof grade, with curved glass, anti‑fog, suitable for all ships, boats, yachts and so on. 4、Ultra‑wide working voltage design, long‑term working voltage is 9‑32V, maximum voltage is 36V (less than 1 minute). 5、The stepping motor is suitable for all stepping gauges and has the advantages of low power consumption, long life, and high accuracy. Specification： Condition: 100% Brand New Item Type: Boat Tachometer Material: Stainless Steel+Nickel-Plated Plastic Backlight: Red Installation Diameter: Approx. 85mm/3.3in Operating Voltage: 12V/24V Operating Current: ≤100 MA Functions: High accuracy current tacho/RPM and hour Operation Mode: LCD display, stepper motor Connectioning:  Red-Battery(+9-32V DC) Blue-Battery(-) Black-Signal Orange/Yellow-Blacklight(+9-32V DC) Indicating Range: 0-4000RPM Input Signal: Pluse Signal from tacho sensor, engine, alternator, ignition coil, crankshaft sensor, etc. Protection Class: IP67, can work underwater 1m position Application: Tachometer fit for Car /Truck/ Boat /Diesel Generator Engine /Gasoline Engine Package List： 1 x Boat Tachometer 4000RPM 1 x Connecting Cable 1 x Manual