Universal fits most motorcycle models such as Honda Yamaha Kawasaki Suzuki etc. Input Voltage: DC 12V, Tachometer Measurement:0-13000RPM. Material: stainless steel; mirror diameter 58mm; outer diameter 68mm. Wire connection??long red-positive; long black- negative; short black-power/ignition lock positive; short green- ground; yellow/black- engine signal. Package Includes:1 ?? tachometer; 1 ?? manual. Product Description Silver stainless steel construction Input Voltage: DC 12V Measurement: 0~13000RPM Size: 60mm x 56mm (2-3/8″ x 2-3/16″) Mirror Diameter: 57mm(2-5/8″); Outer Diameter: 68mm(2-5/8″) Wire connection: Two long wires for lamp: long red ?C positive, long black ?C negative. Three short wires: short green ?C ground, short black ?C power/ignition lock positive, yellow/black ?C engine signal (some models need to attach high voltage signal line)