Nice job, clean install, you did some planning and it shows. Let us know how they work and what you feel with them in the system. Are you able to close them off for a before and after test? Also, did you have any leaks at the compression fittings? They always seem to need a few more turns.
Are the pressure sensors electrical so you can switch the inputs at the gauge to read the various locations?
Kevin, it looks like you used 1/2" air line between the bags and the tanks, right? Since one wants as much volume flow as possible for the tank to serve the purpose that would make sense. The fitting into the bags are only 1/4" typically as well as most small tanks. What size of tanks are those? 1 gallon tanks? I see that they are Viair, and the Viair ones that I can find only have 1/4" fittings, at least on airbagit.com's site.