Eventually after many issues getting fittings that would work - I had to go with 4 of them, I cut out the 3/4" copper pipe and attempted to install the whole contraption with all 4 fittings connected to the flow meter and six inch length of 1" copper. I just cannot budge the copper pipe on either end to fit the whole thing in to push the two SharkBite fittings onto the existing 3/4" copper pipe. They are totally immobile. I can get one side in but I cannot lift the upper pipe at all to fit it into the SharkBite.
Now I have an open gap in my copper pipe and I have no irrigation for the time being. This is a real problem in Arizona. What can I do?