(042) is the settable speed value: Long press the left button for 3 seconds 042 hundreds of digits 0 flash, short press the left button to add 1 (adjustment range 0-9), Press and hold the left button for 3 seconds to switch to 10 digits and flash 4 times. Short press the left button to increase 1 (adjustment range 0-9),Then long press the left button for 3 seconds to switch to the unit number 2 flash, short press the left button to add 1 (adjustment range 0-9), Press and hold the left button to switch to 1,15 seconds to automatically exit the background setting without operation. C, 1 means fuel sensor 1 means fuel sensor resistance value 8-98; 5 means fuel sensor resistance value 33-566.Short press the left button to display 5, then short press to display 1, long press the left button to switch to the back for 2,15 seconds, no operation will automatically exit the background setting. D, 2 represents the number of rotating cylinders. 2 means 16.6 Hz corresponds to 1000 rpm, 4 means 33.3 Hz corresponds to 1000 rpm.Short press the left button to display 4, then short news display 2, and finally press the left button and hold for 3 seconds to save and exit the background setting interface (or automatically exit the background setting interface without operating in 15 seconds), the working interface displayed by the meter . Extension variable frequency operation: for example: 220\/50-R17 tire with a circumference of 2.05 meters and 2 signal sensors1000\/2.05x2\/60=16.25, take the integer 16. 16 Hz to 63 km\/h. Use the button to modify to 016, then long press the left button switch, then long left button to switch to 2, and finally press the left button and hold for 3 seconds to save and exit the background setting interface (or automatically exit the background setting at 15 seconds No operation inside), the working interface displayed by e instrument.Colour: Blackmaterial: plasticInstallation settings:Light blue: turn rightYellow\/Blue: RPMRed: battery + (clock)Blue: Green\/white: water temperatureGreen: negativeOrange: turn leftBlue\/white: signal for fuelBlack: key switchGreen\/Red: N equipmentPink\/Red: 1 gearBlue\/Red: 2 equipmentGreen\/Black: 3 equipmentYellow\/Red: 4 gearsGray: 6 gearsBrown\/red: symbol of faultIts speed sensorBackground parameter settingA. Hold down the left button first, and then open the door lock. After the LCD self-test is completed, jump to the background setting interface. The default display is 042 1 2 15 seconds, no operation will automatically exit the background settings.B, 042 is the vehicle speed frequency, 42Hz to 63km\/h.Frequency calculation: 1000 \/ the circumference of the tire rolling a circle x the number of sensor signals \/ 60.for example: 110\/70-R17 tire circumference 1.86 meters and 2 signal sensors1000\/1.86x2\/60=17.91, take the integer 17.Including:1 x instrument panel1 x magnetic sensorOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +\/- 1-3cm.