Hi There.
(wire=cable)
any good Speedometer repair shop can make you this cable.
I can make you this cable for less than $20 on the spot in about ten minutes.
you could also go to the junkyard or the dealership. some Part houses may be able to get you this cable also.
If you do not need the Cable then you are in need of the Electrical Speed Sensor that drives the Spedometer. I would keep checking the junkyard as they are sort of expensive from the dealership.
i hope this helps. Good Luck!