A "gas management board" is one of those "in" things that you can consider is essential, or else happily do without. Home brewers have always been a bit "adhoc" with their CO2 management, so I suppose these "management boards" do paper over lots of "technical detail" and give one the impression you are doing everything right. But to do everything right there is lots of farting about and tinkering.
So either stick to the adhoc approach and expand on it in time to be your most "excellent" setup. Or tie yourself in with a "gas management board".