Yeah, being colorblind would make that part difficult. Lol. I'm a control system maintenance tech in a chemical plant. We were doing interlock checks once and needed some extra help to verify actions in the field. So they sent one of the old mechanics out with us. I said stand right here and watch these lights and tell me if the red or green comes on. I went to the IO room and tripped the interlock and asked him over the radio which one came on. He said well a light came on. I said was it red or green. He said I don't know, I'm colorblind. Lol. We put him in charge of watching block valves to see if they closed instead.Looks much better.
Random story from the plug and play/matching wires. Years ago I had a buddy call having issues wiring his aftermarket radio. Was a plug and play kit.
Me: Match the same color wires together and you are done. Green to green. Red to red. Etc.
Him: I don't have those color wires.
Me: what colors do you have?
Him: Grey. Lighter grey. Black. Darker black….
Me: Are you color blind?
Him: yes. Now that you mention it, I probably shouldn't be doing any wiring…
It's a great upgrade over stock, and really easy to do. It took me maybe an hour and a half spread out over two mornings before I left for work.