Do I do anything different from the plans canted indentation to use Vance Atkinsons fuel gauges?
Various solutions are being used. The simplest is to use a rectangular indentation (so that you can have the gauges flush with the sides) which is flat, not canted, since Vance’s gauges have a 180 degree view anyway. Others have installed them in a canted indentation per plans. Note: be sure to make your indentation long enough so that your top and bottom fuel holes will go through glass-to-glass and not glass-foam-glass. The second edition plans (#501, up) point this out.