Your ACS3 kit will arrive ready for installation based on your fork, weight and indicated riding style, but you may want to make some changes yourself.
The kit comes with an upper spring cap and two small discs, which are for spring preload if required. Using the cap without the discs means minimum preload and this is what we recommend you start with.
If your fork is sagging too much and you want to add a little bit of preload to raise the ride height of the fork, you can install one of the preload discs inside the upper spring cap to give 2.5mm preload or both to give 5.0mm preload (referred to as 100 thou and 200 thou by Darren in the video).
We'd recommend leaving your rebound and compression settings unchanged for your first ride with your ACS3 installed, then tweaking if necessary.