Honda VT750 Shadow 1997 speedometer issue
 

Hello all,
I own a Honda VT750 Shadow 1997, and since 6 month the speedometer, isn't working, one day I was running about 110km, (60miles) and the needle on the clock went ticking up n' down few times, and than down for good.
I've try to pull the speedo ,and sensor out, cleaning it and put it back 3 times now, the seedo seam to be ok the lights are on, and the trip clock it is on, but when I run the Bike the speedo does not move.
Any body know how to repair ir, or where to buy the Speedo set at good price?
Many Thanks'