Welcome to our store attractivefinesuper.th.Wish you have a good shopping. Description: Backlight LED Night Light Tachometer Tacho Gauge Speedometer 12V Motorcycle Feature: Stainless steel construction Measurement: 0~13,000RPM Input Voltage: DC 12V Size: approx 60mm (2-3/8")*56mm (2-3/16") 58mm(2.3") mirror diameter,68mm(2.7") outer diameter Universal fits most motorcycle models(Please check the size before you purchase) Instructions: not included Aftermarket LED backlight motorcycle tachometer Lightweight & portable circle design,high capacity black face Internal night light,full-sweep red illuminated index Allow to read the real-time speed clearly General mechanical speed line interface Wire Connection: Long red- positive, Long Black- Negative Short Green- Ground,Short Yellow/Black-Engine Signal Short Black- power/ignition lock positive Included:1 X LED Backlight Motorcycle Tachometer