i am looking into a speedometer for an xr650 i am picking up and wanted to know my options. i know trailtech makes a digital one. i am looking for a geardriven one i would like to use the existing cable that the xr already comes with and just plug that into some unit that is for sale. only problem is every time i search the internet for a speedometer all that is coming up is digital ones. anybody know where i can get one.