Everyone is so helpful. This project is really coming along. Thanks to all of you. So, I got the pressure reducer. I have been reading the manual and it answers a lot of the questions that I have been asking. Today was spent filling the potable water tank to wash it out with bleach. I hooked the city water line up with the pressure reducer and everything worked [kitchen sink, bathroom sink, toilet] except for the shower. It leaked a little bit of water out of the hose and then did nothing. Wonder what that could be... I also attempted to calibrate the tanks. Since I filled the fresh water tank I decided to fill the gray and black water tanks with the hose and calibrate them.
Using this chart and these instructions:
My problem was that when I hit the test switch [no matter what tank was selected] all the lights lit up and when I turned the thing inside with the screw driver nothing changed no matter which way I turned it. Any ideas?