I use the Towa Bobbin tension gauge on every bobbin change. I always have. In fact, I bought it at my class on how to use my new Gammill. I was interested in the top gauge, but after watching the video, I'm not interested anymore. It requires installation and you have to find your perfect top tension than make note of the reading. I really don't have much of a problem with the top tension. I test it and make slight adjustments before each quilt. Hope this helps.