85mm Waterproof Tachometer 0-3000/0-4000RPM for Car and Marine Use with Hour Meter, 7 Color Backlight, RPM Sensor, M16/M18 Thread, Compatible with 12V and 24V SystemsFeatures: 1. Sleek design enhances vehicle appearance 2. Includes installation manual 3. 7-color LED backlight for customizable display 4. High accuracy digital readout 5. Suitable for cars, trucks, boats, diesel generators, and gasoline engines 6. Available measurement ranges: 0-3000RPM, 0-4000RPM, 0-6000RPM Specifications: Material: Stainless Steel and Nickel Plated Plastic Working Voltage: 12V or 24V Wiring: Red (Power +9-32VDC), Blue (Ground), Black (Signal), Orange (Backlight +9-32VDC) Measurement Range: 0-3000RPM, 0-4000RPM, 0-6000RPM Input Signal: Pulse signal from speed sensor, engine, alternator, ignition coil, or crankshaft sensor Adjustable Speed Ratio: 1-300 Protection Rating: IP67 (suitable for submersion up to 1 meter) Package Includes: 1 x Tachometer 1 x Installation Manual Note: Sensor not included Sensor Details: Thread Size: M16 or M18 Note: Gauge not included with sensor purchase