Secondary vacuum pods

Thanks for the answers. For some reason i was thinking I had to put a tee between them and draw vacuum from somewhere else. So here's another question that someone may be able to help with. I've purchased the spring kits to make changes for the secondarys to open. Which ones would you suggest I start with? My pods are aftermarket so I can change them with removing from carb but just remove the top.
Thanks rod
I would get the adjustable diaphragms from Quick Fuel. Never change a spring again.