85mm Waterproof Tachometer 0-3000/0-4000RPM for Car, Marine, and Diesel Engines – Includes Hour Meter and 7-Color Backlight – Compatible with 12V and 24V Systems Tachometer with RPM Sensor – M16/M18 Thread Size – Digital Display with Adjustable Backlight Color Features: 1. Sleek design enhances vehicle instrumentation 2. Includes installation instructions 3. 7-color LED backlight for customizable display 4. High accuracy digital measurement 5. Suitable for cars, trucks, boats, diesel generators, and gasoline engines 6. Measures RPM ranges: 0-3000, 0-4000, and 0-6000 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 (water resistant up to 1 meter) Package Includes: 1 x Tachometer 1 x Installation Instructions Note: Sensor not included Additional Package: 1 x M16/M18 Sensor Note: Gauge not included