Mto3,
My Presto has a dial guage, but I bought a special weight so I did not have to rely on the dial. With a dial guage, you are supposed to get them tested every year to make sure they are accurate, and I did not want to have to fool with that. Not to mention, if there won't be a way to get it checked.
To me, the wieghted gauge is so much easier. I can listen to the rocking while I am doing other things in the kitchen, not standing there watching the darn dial all the time.