As cheezel said ^^^^
gotta take the dash facia off,The Plastic Surround around the Cluster,Unscrew the cluster,Unplug the cluster,Pop the clear cover off,pop the black cover off,turn the cluster over and unscrew the 2 silver screws in the middle, turn back over and unscrew the tiny little black screws on the Cluster Card then pull out the speedo out of the white body...... u should see a silver looking gear thing with 2 tiny black screws in it... unscrew that then pull out the gear thingy and u should be able to pop the Broken gear (silver and orange gear) off the tiny little shaft on the gear turner thing....
Good Luck Dude..