Product information: Product material: aluminum alloy Applicable models: all mechanical speed models Product color: black shell Product size: 5.5 * 6.5 * 7.5cm Product functions: 1. Speedometer, with a maximum display of 199. Can be set to KM/H and MPH 2. Tachometer, maximum display 10000 rpm 3. Oil gauge, with two lines (8-98 Ω) and three lines (33-565 Ω) 4. Odometer, including cumulative ODO and zero return TRIP, displays ODO by default Wiring mode: black - positive wire, green - negative wire, black - red - speed signal wire, blue - white - fuel quantity signal Press and hold the black button at the back for 3 seconds to change the light Wiring mode: 1. Backlight, 7 colors in total, can be switched freely: press and hold the key for 3 seconds to switch the backlight color when the odometer is ODO 2. Switching between KM/H and MPH: press and hold the key and do not release the switch again. The screen displays P0000. At this time, bit 0 flashes, long press and hold to skip to 10 bit 0, short and safe 10 bit displays 1, long press and hold to skip to 100 bit flashes, short press and hold to skip to 100 bit displays 6. Press and hold the thousand-bit flash again, and press and hold the thousand-bit display 6 for six times. At this time, the screen displays 00466, which means 46.6HZ to skip 60KM/H. Short press and hold (this item does not need to be set). At this time, the screen displays 10011001, which means KM/H. If you want to switch to MPH, long press and hold the thousand-bit flash, and long press and hold to switch to 1002, which means it is set to MPH. Short press and hold to skip to the next item 3: Speed cylinder number setting After that, short press the screen to display 2002, which means that it is 2 cylinders (166HZ corresponds to 10 * 1000RPM/MIN). Short press and long press to skip the flashing of one position, and then long press and long press the position 2 to switch to 4, which means that it has been switched to 4 cylinders (333HZ corresponds to 10 * 1000RPM/MIN). 4: Oil gauge setting. Connect to the above, short press the screen to display 3002, which means it is a 2-wire oil meter at this time, short press all settings to save and exit, long press the single digit to flash, and long press the display 3003, which means it has been switched to a 3-wire oil meter, short press to save and exit Packing list： Oil gauge*1