Yes the Napa PVC valve is essentially what I used. The one I used had 5/8" ends to match my heater hose that I used to connect everything.
I have attached a very crude sketch of how I hooked it up.
Looking at the Jetta PVC valve that you posted it does not appear to have a vacuum port. So does it have a ball or a diaphram/spring valve? If it has a diaphram/spring type valve and it does not rely on gravity to close the valve so you could just install it directly into the side of the valve cover and connect it to #12 of Jonathon's diagram?and plug the vacuum hose.?
It never occurred to me to use a diaphram/spring PVC valve when I was doing it. I think it would have been easier to use a valve with a spring.
My understanding of the PVC valve is that the valve portion is there to prevent a fire in the crankcase in the event of a backfire.
Do fuel injected engines backfire like the carbureted engines did?
