Yeah I went through the same darn thing and I am Canadian!!!
I am from the old school when we once used the imperial system like you guys use. Sometime in the mid 1970's Canada switched over to the metric system. For what reason? Who knows? But sometimes even I get a brain cramp trying to figure out litre/gallons. But you know what I do? I use that little hole on the side of the gearbox that leaks fluid out and when it comes out steady I know that the gearbox is full. Just remember to put the screw back in that hole on the side!
What I'd like to know is, where the heck do I find a funnel small enough to fit that tiny hole on top to refill the gearbox? What do you use?
Have fun and keep ridin'.