I got it all back together and took it for a spin yesterday, the speedometer is working again.
I put a little light lube on the gears in there and spun it around.
I think I might take the speedo cable out and lube it real well. Something to add to the list.
an update to my lil blog about my old truck:
07/29/2012 : instrument cluster taken apart, speedometer close up
Thanks jocko.
-W