I got quite a bit of help, and I'm sure without it, I would still be trying to use air hose fittings and adding on needless extras.  So bare bones and simple it is.  I was able to get some work done today.  I got all my suction connections taped and cinched down.  I have a 3/4" L type ball valve to switch from batch to rinse.  I see that there is a valve motor that fits this valve.  Maybe some remote tank switching is in the future.  The pressure test went fine.  Only one small leak.  My pump is set nicely and cycles great.  I had previously been concerned about low flow rates, but I needn't have worried.  With the tips I have, I get good distance, around 30' on the low pressure, and a bit more on the higher pressure tips and great flow.  However, I'm only using 100' of 1/2" presently.  All I have left to be operational is to make up a battery mount, tie down the tanks, and dress up my 12 volt wiring.  I will be getting a good High ampere hour battery soon. The light switch is working just fine for the pump.  I dropped all my plans to wire and plumb up my spare pump with a bunch of confusing valves, and in keeping with the KISS advice, I'll just keep the spare handy until needed.  I thank all you fellas for getting me focused.  I'm working on my trailer painting next. I was thinking of having some banners made and attaching them to the sides and rear of the trailer.  I am extending the tongue on my tiny trailer.  Its almost  impossible to back up.  I made my first promo contact today at a very nice mobile home park with a very dirty white vinyl fence.   Who knows? 

10:4 on rinsing the pump out. Thanks again.  The sides of my trailer will fold down when working, and fold up when I'm on the go. That's the plan. I hung my side flaps today. Found that I'm a bit out of square...