Speedometer on my 2006 Arctic Cat F5 is not working properly?

I just bought a 2006 Arctic Cat F5. The speedometer and the odometer do not work, but the RPM gauge is working properly and so is the hour gauge. Has anyone experienced this problem and if so how do I fix it?|||The sensor may have come unplugged or is bad. Unplug it by the gearcase and check the ohm reading as the track turns. It should show a pulse which will increase as speed increases.