Features： 1、Materials: Made of premium 316 stainless steel, PVC and ABS, can be used for a long time even in acid, alkali and humid environments. 2、IP67 Waterproof: Come with curved glass, anti fog, no need to worry about the damage bad weather may cause, durable in use. 3、Wide Application: suitable for a full range of stepping instruments, can be used for engine, generator sets, ships, agricultural machinery, etc. 4、High Performance: 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. 5、Easy to Install: Come with a detailed product manual clearly describing the installation, wiring and use functions of the superior gauge. Specification： Item Type: Tachometer Material: 316 Stainless Steel + PVC + ABS Backlight Color: Colorful (Adjustable) Signal: Speed Pulse Measuring Range: 0-6000RPM Working Voltage: 9-32V DC Installation Diameter: Approx. 85MM/3.35in, and ensure that there is at least 55MM/2.2in space behind the dashboard. Working Temperature: -30℃ to +75℃ Storage Temperature: -40℃ to +80℃ Application: Universal for automobiles, engines, boats, RVs, yachts, engineering machinery, etc. Package List： 1 x Tachometer  1 x Manual  1 x Screw Cap