speedo cable broke. It unwinds in the sheath and just twists apart. If the cable is good (unscrew ferel behind speedo and drive a little, see if it turns, then try and hold it steady) if thats turning, there is not much in the speedo but a flying magnet on the cable, and a metal dish it spins in. The meal dish is connected to the needle and it sort of uses a torque convertor like method of transferring one rotation to another without a direct link. The needle is on a light clock spring so it doesnt just spin like a second hand. My bet is the cable, you buy them in a universal length and cut and stake the end on it at the right length, you got about 1/4 wiggle room so measure twice, cut once. Lube with powdered lock graphite, not grease which can harden.
