14 zones currently I bought 2 controllers

How do I set up 2 controllers that I have so they do not run concurrent? There is not enough water pressure to have two zones running???

Very unlikely that you have enough water pressure to run two zones at the same time. If I was you with two controllers I would set my durations and zones in each controller schedule and then for one have that schedule “end by XXXX” time and in the second controller have its schedule “start by XXXX” time. That way they will still run seamless as one but not both be on at some point.

Thank you very much