Speedometer Problem? Options

[Drolius]

I have an issue with my speedo guage, and I don't know whether it is a issue with the actual cluster, or if it is the tranny or speed sensor. The speedo needle never moves from the 0mph resting point. Once in a blue moon the speedo will work, sometimes when going over bumps but not often, it sometimes works one day and not the next...it hasn't worked for over a month now. All of the other guages in the cluster work fine. Does anybody have any usefull insight?

Thank You!!!