This is from a post a while back that should get you in the right direction.
The dash switch only adds vacuum (when pulled out) or takes away vacuum (when pushed in) from the relay switch. If you look at the relay switch when off the car you can see that the small hose connection is used to pull the internal plunger up when vacuum is applied thus allowing the main vacuum which enters via the Yellow hose to the Red hose circuit and the actuators ( in theory) should open.
Now all instructions I have seen show the Red hose connected to the back of the actuators. This is WRONG. Red connects to the front and Green to the back. If in doubt use a hand held vacuum pump and this will show you what I am explaining.
Standing in the front of the car the "T" off points should be: Green to the left and Red to the right like the crappy drawing shows.
68 RS, Ash Gold,pwr brakes,pwr windows,Hounds tooth,355/T350,MSD 6AL,3200 stall Dynamic converter,3.31:1 posi,Autometer guage pod
[This message has been edited by CA420 (edited 03-15-2002).]