Not sure I can say much more than described.
It is just a tool, and a very basic one at that. Since it cuts one cylinder out of the picture at a time, it allows you to see if there is a problem with that cylinder. All of the percentages should be within 3% of each other iirc. It's just fun to watch and feel the control over the engine. If one percentage is way off though, you will have to figure out what the problem is.
I believe my cylinders, when tested, were all around 93%.
As far as the brackets in the boost conversion, I believe the answer is yes, from other custom PID's I've seen. Try it out and let us know. If it doesn't work then it's not going to hurt anything.
