Not sure how the others do it, but you could use something like a marker or chalk to mark the fork and triple...then just match the lines during re-install.
Also...the bottom of the forks might have stickers, make sure they are in the same position.
For me, installing my new forks I initially used the stickers on the outer tubes to line them up. Then I adjusted the preload to fully closed...then matched them from there.
Again, some of our more knowledge able members will have a more correct method.
2001 SP1 (sold)
2004 SP2 (properly stored)
2012 Ruckus (stolen)
2015 Grom (under construction)
Weyrauch pronounced (Y Rock)...Rock for short.