Mini Round Tachometer for Boat Motor Car Hour meter Digital 0-9990 RPM 3.346 (85mm) Truck Boat Digital Tachometer 0-9990 RPM With Hourmeter fit for Boat Car Truck Motorcycle Red Backlight Specification: 8 color Backlight color: red.green.blue.white.yellow.olivine.orange.purple, you can choose one color you need by pressing the back button of the gauge. customers can adjust any color that you like Material:stainless steel 316L+anti-fog glass Install diameter:85mm or 3-3/8 Indication range: [Plese choose one that you need, when you place an order] 0-3000RPM 0-4000RPM 0-6000RPM 0-7000RPM 0-8000RPM Connection method:row insert Working voltage:9-32VDC Input signal: pulse Working current::100mA Operating temperature:-30~+75 Storage temperature:-40~+85 Grade of protection:IP67 Features: With ultra-wide working voltage design (long-term operating voltage:9-32v,maximum up to:36v) Gauges front cover use stainless steel 316L for long-term use even in acid-base and humid environment IP67 waterproof and dustproof grade Stepper motors used for full range of stepping gauges,great feature with its less power consumption,longer life,higher precision etc. With curved glass (with anti-fog function) Install Instruction: 1)Opening a hole in the panel (your cabin board and dashboard) with a diameter of 85mm,insert meter into the hole,the panel corresponding to the instrument panel is marked with a convex table,and open a small notch in this location,to ensure that there is at least 85mm (3 3/8 ) of the instrument panel at the back of the 2)After the instrument is mounted in the panel,screw down with a fixed ring 3)Connect the wire,the instrument housing is directly connected to the 12/24v power supply 4)Insert wire harness,firmly locked in the table Package includes 1 x Tachometer 1 x Wiring harness 1 x Instruction manual Backlight Color Adjustment 1)Press the Set button (less than 1 second) to change the backlight color: Backlight changed in sequence: red (default) green blue white yellow olive orange Purple (automatic). Press the back Mode button on the gauge for 3 seconds,then it will enter into the speed ratio set up mode,if the button is released for 3 seconds,it will exit the speed ratio set up mode,and automatically retain the setting data As the tachometer is in setting mode,press the button to select the speed ratio required.for instance,the pointer point at 1000rpm is for 2 cylinder engine,when the pointer point at 2000rpm is for 4 cylinder engine.