1、Adopt stepper motor drive pointer, accurately display the engine speed, with high indication accuracy, relatively simple driving and control. LCD display, clearly displays the mileage. 2、316L stainless steel, corrosion‑resistant, can be used for a long time even in acid, alkali and humid environments, IP67 waterproof and dustproof. Curved glass, good anti‑fog effect. 3、Stepper motors used for full range of stepping gauges, with low power consumption, long lifespan and high accuracy. Ultra‑wide working voltage (long‑term working voltage: 9‑32V, maximum up to 36v, (≤1 minute)). 4、There is a snap together with the harness connector to achieve the best and firm connection, so that the pressure gauge can work normally even under strong vibration. 5、It is suitable for the modification of various vehicles, and can be used for engine/generator sets, ships, construction machinery, agricultural machinery, automobile modification, etc. 1 x Speedometer 1 x Power Wire Harness1 x Manual Item Type: Speedometer Material: Stainless Steel 316L Bezel+Anti-Fog GlassInstall Diameter: 85mm / 3-3/8inIndication Range: 0-120KM/HWorking Voltage: 9-32VDCInput Signal: Pulse SignalBacklight Color: Red Operating Voltage: 9-32VDCOperating Current: ≤60mAOperating Temperature: -30℃~+75℃Storage Temperature: -40℃~+85℃Protection Class: IP67, can work underwater 1m positionWiring:Red Wire Connect to Positive PoleBlue Wire Connect to Negative PoleBlack Signal Wire Connect to SensorOrange Backlight Wire Connect to Positive PoleInstallation Notes: 1. Cut a hole 85mm in diameter in the panel (your engine room panel and instrument panel) and insert the meter into the hole corresponding to the panel marked with a bossand make a small notch in this position to ensure at least 85mm (3 3/8in) instrument panel on the back of the instrument. 2. After installing the instrument into the panel, screw down with the fixing ring 3. Connect the wires, the instrument shell is directly connected to the 12/24V power supply 4. Insert the wire harness and fix it firmly on the table