For those of you who have and use the Vector Grind Fixture JoHannes has a new video on how to sharpen all your tools on the system. Here is the link.
This is the method I use. I painted the split PVC and wrote on it the gouges it is for. When in use this piece is locked in place so I can easily tell what the arm is set for.Personally, I like the idea of using a length of aluminum angle or split PVC pipe to mark the distance for the v arm pull out. It's cheap, easy to label in detail and repeatable. It doesn't decrease the resale value, either. And if I were to change grinders, they are easy enough to remake.