I used to work for a company that made gauges. We had a special tool made for removing pointers. Even with the tool it destroyed the movement some of the time.
My suggestion would be to use a small needle nosed pliers layed on the side. Put a small piece of wood or plastic (popsicle stick?) on the dial to act as a fulcrum. Do NOT grip the pliers to the shaft! Push down on the handles to pry off the pointer.