I use the gauge in a number of ways. I use it to check bias setting, I have used an electronic scale placed on the pedal and made note of the two readings (foot pressure versus pressure at the caliper), heck I once used a fish scale to pull on the pedal. It is mainly for data collection and diagnostics. Teams with tons of data can use it to static set cars up for different tracks. For us, it tells us that things are working as they should and it confirms that the calculated numbers are correct so that we can make changes with a greater degree of certainty. You don't have to have it but it is a tool that I bet most of your buddies don't have in their box... so you can impress your friends with it
