Vacuum sources created equal?

I think as long as you don't create to much volume of vacuum you should be ok with tee-ing things off. I redid the whole vacuum system in my car using a 1.5"x6" long piece of pipe as the new tee. It sorta created a vacuum lag everywhere and overall less vacuum, bad. So going back to something as small as the stock tee and tapping more lines directly to the upper plenum took care of that. Vacuum systems are strange. I would suggest that running as much as you can directly off the plenum would probably be best, but tee-ing off once per line won't hurt anything.