3 Bears Motorcycle Speedometer Tachometer Odometer Rev Counter 0-13000 RPM Material: Stainless Steel,Easy to install,the best replacement for your old odometer long Red light +,long Black light -,Short Black power/ignition lock +,Short Green Ground,Short Yellow engine signal line,and some models need to attach high voltage signal line Size:60(D)mm*55(H)mm it is also for electric .if your tach is electric .it is ok for you Fits for motorcycle (4 stroke)