I have a 2006 roadliner and the speedometer quit working Do you have any suggestions on where to start looking

First check to make sure your needle sweeps when you turn the Key on. If it does not then make sure everything else works Fuel gauge,indicator lights odometer. If no then check for power to the unit the factory wiring diagram shows what wire this is. If everything else works and you have power. Is your odometer clicking off the miles you ride? If NO! check your speed sensor. If YES! It sounds like your speedo motor is dead. Hope this helps