Features： 1、High Quality Material: Made of stainless steel and ABS, can be used in acid, alkali and humid environments, durable and have a long service time. 2、IP67 Waterproof And Dustproof: IP67 waterproof and dustproof grade, with curved glass, anti‑fog, no need to worry about the damage bad weather may cause. 3、Excellent Performance: Low power consumption, long life and high accuracy. With ultra‑wide working voltage design, long‑term operating voltage is 9 to 32V,maximum can up to 36V. 4、Easy Installation: Easy to install, with a detailed manual, will clearly describe the installation, wiring and use functions. 5、Widely Use: Suitable for a full range of stepping instruments, can be used for car, engine, boat, RV, yacht, engineering machinery, etc. Specification： Item Type: Tachometer Material: ABS+stainless steel Lighting Color: 7 color (adjustable) Signal: Speed pulse Range: 0-4000 RPM Operating Voltage: 9-32V DC Install Caliber: Approx. 85mm/3.35in, and make sure there is at least Approx. 55mm/2.17in space behind the dashboard Operating Temperature: -30℃ - +75℃ Storage Temperature: -40℃ - +80℃ Fitment: Suitable for cars, engines, boats, saloon cars, yachts, engineering machinery, etc. Package List： 1 x Tachometer 1 x Instructions 1 x Screw Cap