1995 ford f-700 (speedometer stuck) help!

1995 f-700 5-speed man trans....2-speed rear end....speedo. Stuck ....I tried a different GUAGE cluster, same thing.....i checked the sending unit magnet at rear of trans, it looked ok....help!.....

Is it stuck at 0mph or??? If at 0 then check voltage input for a short. If other... check to see if the voltage changes... This can be very small measurements so you will need a decent quality voltmeter

F-700 WAS STUCK ON 65mph WHEN WE GOT IT