I just did this about 2 weeks ago. I got my gears from: http://www.odometergears.com/subpages/ford.html
The guy is excellent to deal with. You have to remove the bezel (sp?) surrounding the cluster. Then remove the torx bolts that hold the cover onto the cluster then just pull the speedo out. You don't need to remove the entire cluster. There are no bolts that actually hold the gauges in place. The pins for the electrical connections actually hold it in place. So just pull straight out on it firmly and it will come out. Remove the needle carefully then you will flip it over and remove the 6 screws that hold the whole thing together. I just needed the small gear and not the bigger gear. I would have posted some pictures on how it's done but I don't own a dig. camera. Just send me a message and I'll help you if I can.
1995 4.6L XR7 Dual Guage Pod with Oil and Temp., 255/60R15 Yokohama Avid S/T's, Screamin' Demon Coil's with Live Wires, K & N, modified stock oil pressure gauge, air silencer removed, stock air box, trans and tune by Darrin, TC by Dirtydog
Sometimes when I reflect back on all the beer I drink I feel ashamed. Then I look into the glass and think about the workers in the brewery and all of their hopes and dreams. If I didn't drink this beer, they might be out of work and their dreams would be shattered. Then I say to myself, 'It is better that I drink this beer and let their dreams come true than to be selfish and worry about my liver.'
Spend your money on your ride and not your girl. It'll last longer and fewer people have been in it!