i did it, but I'm not sure if I did it right. It was on a 96, and I took the cluster all the way apart untill I could barely move the little numbers with my fingers. It was possible to get a little screw driver behind the spinner(my name for the numbers), and I can't remember if there was a little lever to push on or not. I ended up just forcing them into the position that I wanted them, if you slide them over one way and spin at the same time you can *click* them one digit at a time(not one mile, but one digit ie:1's, 10's, 100's..). It sounded like it might be breaking inside, but it worked fine once I put it all back in.
Good luck, hope this helps a little.
P.S.-sorry, but i dont have this jeep anymore so i can't look at it. I upgraded to a 98 sport, so its all electric now.