When I needed to use the Honda generators to run the a/c awhile back I thought I had it all figured out, but I didn't. Called Pat (of PatandLinda) and she walked me through what I needed to do. She suggested I label this switch so I can remember it for next time.
That's what I did! It's large enough that I should (operative word being "should") see it and remember what the heck I'm supposed to do next time around. And to flip it back when I'm not running the generators.
(Please don't ask me what EMS stands for. Drawing a blank right now. I just know I needed to bypass it.)
Yeah, I need signs like this to remind me of things like this.