1、Using stepper motor drive pointer, accurate display engine speed, with instructions of high precision, repeatability and versatility, reliability and stability, drive And control is relatively simple and so on. 2、Stepper motor is used for full range of stepping gauges, less power consumption, longer life, higher precision, etc., and with the LCD display clear display mileage. 3、With the ultra‑wide working voltage design, long‑term operating voltage: 9‑32V, maximum up to: 36V, (≤1min). 4、Adopting 316L stainless steel, long‑term use even in acid‑base, humid environment. IP67 waterproof and dustproof grade, also with curved glass (with anti‑fog function). 5、Harness connectors are used with buckles for optimal firmness and for normal use even under severe vibration conditions. 6、Suitable for all kinds of vehicle modification, can be used for the engines/generating units, ships, construction machinery, agricultural machinery, automotive modification, etc. 1 x GPS Speedometer1 x GPS Speed Sensor1 x Power Harness 1 x Manual  Item Type: Speed GaugeMaterial: Stainless Steel 316L Bezel + Anti-Fog GlassFixing Dimension: 85mm / 3-3/8inIndication Range: 0-200KM/H, 0-999999KMInput Signal: GPS SignalBacklight Color: RedWorking Voltage: 9-32VDC (12V / 24V)Working Current: ≤60mAWorking Temperature: -30℃-+75℃Storage Temperature: -40℃-+85℃Dustproof Grade: IP67 Waterproof, can work underwater 1m / 39.4in positionInstallation Notes: 1. Open a hole with a diameter of 85mm on the panel (your cabin panel and instrument panel), insert the instrument into the hole, the panel corresponding to the instrument panel is marked with a boss, and open a small notch at this position, To ensure that there is 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 tableHow to Use: Install the instrument on the instrument panel and fix it, and then turn on the powerWiring Instructions: Red wiring - PositiveBlue wiring - NegativeBlack Signal Wiring - SensorOrange wiring - Backlight