Hello Jackie
When I was an official with the 360 sprints here in Michigan I had a gauge that a friend made. It was used for checking the intake restrictions. Minimum 3" long and 2 3/16th inches across, it was T shaped and was very useful.
As far as Go / No Go gauge it could refer to any almost any tool used to check for a legal or illegal piece.
Being an official could be a tough job but I had a great group of drivers to work with. And I had a close friend who would guide me (chew me out) if I didn't.
Your friend in Christ Randy Cronk.
