Good. I labeled all of my switches and also which gray tanks were for what tank. They didn't identify those either. I also labeled the valve handles in the compartment so you know which one controls which tank.
Mine are labeled by the factory, but I have 2 gray tanks and left the one open and the other closed while there this past weekend because I didn't know what drained into what tank, and the one I left closed was the shower because after my wife took her shower on Sunday, the water was starting to back up in the shower as she was finishing up.