Speedo non functional

Pull the trans end and pull the cable out of the sheath. It probably is broken. If not, you can use a universal replacement cable. Those are cut to length then and end crimped on. Crimp the end in the trans end. The cable should easily slide out. If only half comes out you may have to unscrew from the speedo end to pull the rest out. Get some graphite powder and lube the replacement cable. Oil will work, but graphite is better. Hard to get the graphite in the cable housing though. If you must use oil use a spray silicone. As long as the sheath doesn't have any kinks in it you should be good. Tight bends and kinks will wear the cable at that spot, as will any other damage to the inside.