Features: 1Weatherproof: IP67 waterproof and dustproof grade, with curved glass, anti?fog, no need to worry about the damage bad weather may cause. 2High Accuracy: With ultra?wide working voltage design, long?term operating voltage is 9 to 32V,maximum can up to 36V. Low power consumption and high accuracy. 3Long Durability: Made of 316 stainless steel, PVC and ABS, it can be used for a long time even in acid, alkali and humid environments. 4Wide Application: Suitable for a full range of stepping instruments, can be used for engine/generator sets, ships, construction machinery, agricultural machinery, car modification, etc. 5Easy Installation: Each of our gauge will be shipped with a detailed product manual. The manual will clearly describe the installation, wiring and use functions of the product. Package included: 1 xSpeedometer 1 x Gps Receiving Box 1 x Manual 1 x ScrewCap