85mm Waterproof Tachometer 0-3000/0-4000RPM Car Boat Tacho Meter Gauge Hourmeter 7Color Backlight Tacho Sensor M16/M18 RPM Meter85MM Diesel Engine Tachometer Sensor RPM Gauge REV Counter 0-3000RPM with Digital Hourmeter 7 Color Backlight Optional 12V 24VFeature:1.Racing look enhance the characteristic to your car/vehicle2. with installation manual.3. 7 Color Backlight4.High Precision5.Fitment : Tachometer fit for Car /Truck/ Boat /Diesel Generator Engine /Gasoline Engine6. 0-3000RPM 4000RPM 6000RPMSpecification:Materials:stainless steel+nickel-plated plasticOperating Voltage:12V/24VConnectioning:Red-Battery(+9-32VDC) Blue-Battery(-) Black-Signal, Orange-Blacklight(+9-32VDC)Indicating Range:0-4000RPM, 0-3000RPM,0-6000RPMInput Signal: Pluse Signal from tacho sensor, engine, alternator, ignition coil, crankshaft sensor, etc.Adjustable speed ratio: 1-300Protection Class: IP67,can work underwater 1m positionPackage:1x Tachometer1x Installation Instruction(not included sensor) Sensor: M16/M18Package: 1 X Sensor( not inlcude Gauge)