Help With Instrument Cluster

Working on a 69 barracuda inst cluster. I am trying to remove the speedo and cant get it out because the trip reset knob wont come off. I cant see a set screw or anything holding it on, but I dont wanna break anything. Any ideas??? Also I have several instrument panels from 67-69 b-cudas, some have wood grain, some are chromed and some are black, does anyone know the diff? I know there is a rallye gauge panel, but what is it exactly?
Thanks
4spd