Hello Doug:
On my 2001 38ft, Alpine the third Speedometer was the charm.
After talking to several persons,
Mike Young at Cummins Northwest he said that he discovered it was the program in the speedometer that is causing the problem. He said that the speedometer manufacture made a change in the program and sent some to WRV. Call WRV and see if they will provide you with the upgraded speedometer or the manufacture to obtain the correct speedometer.