Universal 2 in 1 Waterproof LED Digital Voltmeter Tachometer Gauge Metal Odometer Speedometer for Motorcycles

2 in 1 Voltmeter Tachometerit is a combination of digital tachometer and voltage display for motorcycle A necessary equipment that can help you to know the condition of the tachometer Waterproof The housing is 6 chromed electroplating which has better waterproof effect durable and light Wiring Instructions 1 RED wire is connected to the positive accessory wire so it work only when bike is running no battery drain 2 BLACK wire is connected to a negative wire or chassis ground 3 GREEN is the SIGNAL wire it goes to the ignition induction line or the ignition coil input connection NOT THE ONE THAT GO TO THE SPARK PLUG Quality If you installa in a right way it can still work well after many years for use please be patient to calibrate the speedometer Specification working voltage 818V rated voltage DC 12V Backlight Red Blue speedometer with led display