Connection:
Black: Ground(-)
Red: 9-30VDC
Blue: RPM Signal
Yellow: Backlight
White: NC

1. Keep on pressing the rubber button of the backside for 3 seconds, and then enter into setting mode,
if leave button more than 3 seconds, it will be out of setting mode.
2.The value will increase when you press the button. When you leave the button and then press it
again, the value will decrease. Ten longer you press the button.the quicker the value will count up. The
minimum step value is 0.1 and theadjustable range is 1.0~ 360.
3. When you get the required speed ratio value after adjustment, please leave the button. The
tachometer automatically saves the result you set after 3 seconds, If the setup doesn't meet your
demand, please re-setup.
4.Short press the button to change the backlight color : Backlight changed in sequence: red (default)-→
green→blue→white→yellow→cyan→Purple→(automatic).Automatic: Automatically switch the
backlight color every 20 seconds, Cycle switch according to the above sequence.