Name: Motorcycle Tachometer Type: 4 lights with indicator backlight dual odometer Backlight color:LED back is blue, with signal light. Installation aperture:about 9.7mm-10mm Boltage: DC12V Function:dual odometer display, turn signal, engine oil, empty (N) gear indicator display General mechanical speed control line installation interface [Positive and negative wire colors respectively]: Negative wire (-): all black wire, black and white wire Positive wire (+): light blue wire, dark blue wire, orange wire, red wire, green wire, black yellow wire [Instrument function wiring mode]: Connect the black and white line (-) to the (+) = light up the display and pointer Connect the black wire (-) to the orange wire (+) to the green wire (+) = turn on the empty (N) gear and the wick is on Connect the black wire (-) to the dark blue wire (+) to the orange wire (+) = turn left and right to turn on the wick Connect the black wire (-) to the black and yellow wire (+) = turn on the oil wick Colour:silver Material:Plastic + Metal Package Contents: 1 x Motorcycle Tachometer Only 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.