I also have a Towa gauge but rarely use it. I use a method I watched online by a guy whose name has escaped me. He shows you how to feel the tension in your bobbin by lifting it up by the end thread. This has worked for me since I started using this method. Plus I have the upgraded tension whatever it's called on the machine so I rarely have to adjust the top tension.
When I had my machine given a "spa treatment" over a year ago, we were having such a time getting the tension to work so Jim tightened the top tension and the bobbin tension to match much tighter than I'd think normal but it's been working for me so I leave it that way
My Towa Gauge has been in the drawer for practically the whole time I've had it........10 years.