Yah, I tried connecting the vacuum lines in the opposite way, and it still did the same thing.
I've bypassed the ignition vacuum switch and attached a 3/2 valve I had from a W123 spare. I push it to let vacuum through to the shut-off valve. Possibly my most wonky-ass quick fix ever!
Without the vacuum attached the switch behaves the same - ie doesn't spring back.
Testing the vacuum on the switch was done by connecting the mityvac directly to the vacuum switch on the ignition switch. But then it could be something I don't know about.
To clarify. I'm thinking I must test the valve in OFF. If I put vacuum to the ignition vacuum valve in OFF, it should pass through to the IP shut off valve right? If it doesn't, and all the lines to and from the ignition switch are holding vacuum, then it must be the ignition vacuum switch. Right?
BTW, the boost actuated turbo is working great - peaks at 15 PSI and no worries!
Paul
The thing is the ignition switch was working fine for a bit and then quit. So I'm thinking it must be it