The water pump kit allows the pump to be turned off and on from any location in or outside of the coach. Wiring is simple, just run two or three (depending if you want to locally ground or not) to each location you want to have a switch and indicator light. Wiring is from the controller to one switch/light location to another switch/light location. See attached instructions and diagram below.
This kit is being sold by Jim Kanomata at Applied GMC.