reverse polarity with a twist.

OOPS Here is the correct Diagram

I guess we are all posting at the same time. 

1. The valves use a light coil basically like a relay to activate them so they are very sensative.

2. If I use the diode on the the signal wires the way pictured, they don't stop any signals from feeding back.   On the valve twp leg, the diode will stop posative feedback, but not negative feedback.  Or am I just looking at that wrong?

I'm pretty sure that was the first configuration I tried, but I have tried a lot.  I think the biggest problem is the relays and valve coils are so sensative that the minute feedback is setting everything off.

The extra switch issue is this.  This is a 1965 Cadillac with front and back air bag suspension.  My friend doesn't want a modern switchbox  in the car.  I found a 1965 Caddy power seat switch that matches the interior perfectly and fits in the ashtray like it came from the factory that way.  So this is the switch we are talking about so I can't really add another swich.  My general theory is if a switch puts out a signal there has to be a way to use that signal to activate a relay or coil of some sort.  This one is challenging because of both polaritie on one wire, but my favorite saying is "If it was easy, everybody would do it."  There has to be a way we just have to find it.  I really do appreciate people who like a challenge as much as I do.