1Wide Applications: Suitable for a full range of stepping instruments, can be used for engine generator sets, ships, construction machinery, agricultural machinery, etc. 2IP67 Protection: IP67 waterproof and dustproof grade, curved glass, antifog, no need to worry about the damage bad weather may cause. 3Characteristic: It has the characteristics of low power consumption, long life and high accuracy. Ultra wide working voltage design, long term working voltage 9?32V, up to 36V. 4Installation: The installation diameter of the gauge is 52mm/2.05in. Ensure that there is at least 55mm/2.17in behind the dashboard. 5Premium Material: Made of 316 stainless steel, Pvc and Abs, it can be used for a long time even in acid, alkali and humid environments.