To spray or not to spray, that is the question?

My 575 came with a spray setup for preservative BUT did not come with any fancy control box. What would be a good reasonable setup to purchase? I'm not afraid of electrical goodies so installing sensors and all is easy enough, but when done I want something that will work automatically based on recommended settings.
I don't want to waste any bales this year! LOL at least this is the dream.

To spray or not to spray, that is the question?