@franz - Thank you for your candid transparency. I understand fully the effort I worked as a software developer for many years. I have decided to continue with my install of 3 - g3 controllers, 1 is up and running now. The other two will require testing of common wires first before I put the remaining two on line. I am going to install 3 - wireless flow meters, each operated separately by one controller - see here:
I made a drawing of how I want to install them. I will place the flow meters in a 14x21 irrigation box, then in the same size box along side I will install the master valves. The layout of the boxes will give me at a minimum 16" between the master valves and flow meters and on the tail end 16" to a tee back to my current system. Any thoughts or advise would be greatly appreciated. I will take photos when installed, “waiting for my 3 flow meters” .