I picked up some Aluminum wire are the hardward store and ran it between the posts.
The galvanized steel wire had a “caution: contains a chemical known in the state of California to cause cancer”. Yikes! That’s lead! Be careful what you buy.
I installed the lower wire at about waist height (about 40 inches) and the other 12 inches higher. I ran out of wire, so the job is not complete. Also, so I only went between poles with wire and didn’t try to join the wires. I didn’t want the plants to have to grow over wire joints.
I then loosely tied the plants that were tall enough to the wire. Later, I will tie the rest of the plants and finish installing the wire for the trellis.