Hey Larry thanks for responding.
The valves that I am referring to are only mechanical with none of the electrical parts which are typically called "solenoids." Here is a link to the type of valve I am referring to:
http://www.macvalves.com/Catalogs/CT/100.pdf
This particular valve doesn't handle fluids and the trigger port interacts with the other 2 ports (the water would get into the boost control vaccum lines). You can see on the second page of the .pdf the piping chart and how that all works.
Thanks for pointing out the obvious, that I CAN use a normal electrical solenoid with a pressure switch. I am still interested in the pilot operated valves, as I think it would be simpler, but I need to find the right one. The electrical solenoid and pressure switch may be my 2nd option.
Cheers, Craig