Feature: 1. The use of stepper motor drive pointer, 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. 3. With ultra‑wide working voltage design, long‑term operating voltage: 9‑32V, maximum up to: 36V, (≤1min). 4. 316L stainless steel for 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. Specification: Item Type: GPS Speedometer Material: Stainless Steel 316L Bezel + Anti-Fog Glass Backlight: RedCOG: Moving Direction Operation Mode: LCD Display, Stepper MotorWorking Voltage: 9-32V Fixing Dimension: 85mm / 3-3/8inNeedle: Show Current Speed Indicator Range: 0-15 Knots, 0-17MPH Connection Method: Buckle Row Plug, Direct Insertion Working Temperature: -30℃-+75℃ Storage Temperature: -40℃-+85℃ Dustproof Grade: IP67 Waterproof, can work underwater 1m / 39.4in position Fitment: Fit for Speedometer gauge is suitable for all 12V / 24V cars, boats and off-road vehicle motors Installation 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 table How to Use: Install the instrument on the instrument panel and fix it, and then turn on the power Wiring Instructions: Red wiring - Positive Blue wiring - Negative Orange wiring - Backlight. Package List: 1 x GPS Speedometer1 x GPS Speed Sensor1 x Power Harness 1 x Manual