Function: 1. Wide range of applications, suitable for outboard engines, engineering machinery and motorcycle modifications. 2. Using stepper motor drive indicator, accurately display engine speed, high indication accuracy, simple driving and control. 3. LCD display screen, display the time clearly, anti-glare and anti-glare, easy to view pod any angle. 4. Excellent anti-fog function, IP67 rating, the whole coating is completely waterproof. 5. Simple installation and wiring method, no complicated operations, which saves time and labor. Specification: Item Type: Tachometer Material: Aluminum + ABS Scope of application: suitable for cars, outboard engines, engineering machinery, motorcycles Wiring: Black wire: negative power (-) Red wire: 9-32V DC Blue wire: rotation signal Yellow Wire: Backlight White wire: adjustable Instructions for use: 1. The white line touches the negative pole for 3 seconds to go into speed factor setting mode. If you leave the negative pole for more than 3 seconds, you will be exiting the settings mode. 2. When the white wire touches the negative pole, the value is constantly increasing; when the white wire is loosened and touches the negative pole, the value is constantly decreasing. The longer the white line touches the negative pole, the faster the value counts. The minimum counting step value is 0,1, the adjustment range is 1,0-360. 3. After adjusting the speed factor to the requirements, the white line leaves the negative pole. After 3 seconds, the tachometer will automatically save the set result. If the settings do not meet your requirements, reset them. List of packages: 1 x Tachometer 1 x Manual