When you connect the Mechanical one, please remember the Green wire is negative, the Black wire is Electric door lock and the Red wire is connect to power. Motorcycle Meter LED Digita Indicator Light Tachometer Odometer Speedometer Oil Meter Multifunction With Night Vision Dial Description: Working voltage 8-18VRated voltage DC 12VWorking temperature -20 - +70 Celsius Storage temperature -30 - +80 Celsius Digital display speed range 0-199km/h Needle display rpm range 0-12000rpm Digital display odo distance range 0-99999.9kmGear indicator 1-6Backlight BlueInstallation diameter 9cmHeight 5.3cmCable Length 12cm Features: Large anti -UV & Anti-g lare LCD screenAll-in-one design with digital signal processing systemUsing chip technology for most of the componentsMultiple indicator functions as the L/R Turn Signal, High Beam, Position Lights, N LightsHigh withstand voltage up to 100VWaterproof & Anti-vibrationFits for most motorcycle that is with 4 stroke, 2/ 4 Cylinders (default as 1 cylinder of the setting) Function Knob Instruction: 1.Meter working voltage is 12V. 2.Short press the right button for shift between ODO&TRIP . 3.When the meter displayed TRIP, long press the button 3s to reset the TRIP meter. 4.When the meter displayed ODO, long press the button for shift between KM&MI. 5.Long press the button and power on ,keep 5s to get to the setting mode ,the perimeter bit flash, short press the button to modify the number ,No operation automatically move to the next item. The order is :Perimeter - Speed pulse number -rev pulse number - Fuel sensor - ODO, Long press or power off to exit. 6.Negative control: left&right turn signal ,High beam , Positive control: Outline Marker Lamps. 7.The symbol flash when : voltage