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Product Description 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) Color: silver 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 Package Included: 1x LED backlight motorcycle tachometer