Jerry, dig out around your sprinkler valves, you should be able to tell the water feed line or inlet line it to both of your valves, turn off the main water line, cut the feed line, add another tee, then add another sprinkler valve (True Value, Home Depot, Lowe's, etc.) Hopefully you will have one extra wire going to your current valves, the new valve will have two wires, one to the common wire, the other to your "free" wire coming out of the main loom. (the common wire will be tied into each of your valves shown). Dig your trench to your pond, or your skimmer, or wherever you plan on adding the hudson valve, if you bought the 1/2" hudson valve you will need a 3/4" to 1/2" bushing or adaptor as your new sprinkler valve will most likely be a 3/4" valve. If you need any help with any of this let me know, I would be more than happy to make the drive and come over and help you out! Loritx, interesting idea about the fan spray head for the sprinkler, any pictures of the spray in action?
Greg