Feature: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, antifog, suitable for all ships, boats, yachts and so on.4. Ultrawide working voltage design, longterm working voltage is 932V, 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 percent Brand NewItem Type: Boat TachometerMaterial: Stainless SteelandNickel-Plated PlasticBacklight: RedInstallation Diameter: Approx. 85mm or 3.3inOperating Voltage: 12V or 24VOperating Current: 100 MAFunctions: High accuracy current tacho or RPM and hour Operation Mode: LCD display, stepper motorConnectioning: Red-Battery(and9-32V DC) Blue-Battery(-) Black-Signal Orange or Yellow-Blacklight(and9-32V DC)Indicating Range: 0-4000RPMInput Signal: Pluse Signal from tacho sensor, engine, alternator, ignition coil, crankshaft sensor, etc. Protection Class: IP67, can work underwater 1m positionApplication: Tachometer fit for Car or Truck or Boat or Diesel Generator Engine or Gasoline EnginePackage List:1 x Boat Tachometer 4000RPM1 x Connecting Cable1 x ManualNote:1. Each of our products will be shipped with a detailed product manual. The manual will clearly describe the installation, wiring and use of the product, so there is no need to worry about the situation that it will not be used after purchase.2. Each product is packaged in a hard carton, and the bubble cotton is antidrop filling, ensuring that your order remains in a brand new state before receive it.