96 XLT Speedometer trouble

I have a 96 XLT 4WD. The speedometer doesn't work most of the time, but the cruise control does work. I assume that the Cruise Control is getting a signal from the speed sensor. I checked it and the resistance was in specs. (215) I don't know what to check at this point. I removed the instrument cluster and everything looks fine but I don't know how to check the speedo itself. Anybody have a suggestion?

thanks

For anyone interested. It turned out to be the printed circuit on the back of the cluster housing.

Thanks for your fixed post. It may give someone else a place to look when all the easy things have been checked.