1Wide Applications: Suitable for a full range of stepping instruments, and can be used for engine generator sets, ships, construction machinery, agricultural machinery, car modification, etc. 2IP67 Protection: IP67 waterproof and dustproof grade, with curved glass, antifog, no need to worry about possible damage caused by bad weather. 3Advantages: Low power consumption, long lifespan and high accuracy. Ultra wide working voltage design, long term working voltage 9?32V, maximum can up to 36V. 4Installation: The installation diameter of the gauge is 52mm/2.05in. Make sure there is at least 55mm/2.17in behind the dashboard. 5Quality Materials: Adopting 316 stainless steel, Pvc and Abs, can be used even in acid, alkali and humid environments.