1Speed odometer use stepping motor drive pointer, can show the speed of engine precisely, and also can show the mileage clearly with Lcd display screen. 2By pressing the mode button on the back of the gauge for 3 second continuously to switch the 3 different digital display, press the mode button again, you can select trip 1, trip 2 or Cog, but they can not show at the same time. 3Red, green, blue, white, yellow, orange, purple, totally 7 kinds different backlight color, it will change automatically every 1 minute, or you can fix only one color that you like by presssing the gauge back set button. 4IP67 waterproof and dustproof, 316L stainless steel bezel, and equipped with anti?fog curved glass, it can be used for a long time even in acid, alkali and humid environments. 5The wire harness connector has a buckle to achieve the best and firm connection, so that it can work normally even under strong vibration. The speedometer can be used for engine/generator sets, ships, construction machinery, agricultural machinery, car modification, etc. 6The stepping motor is suitable for the whole series of stepping instruments, and has the advantages of low power consumption, long life and high precision. Ultra?wide working voltage design (long?term working voltage: 9?32V, maximum reach: 36V, (1 minute)).