Quick question about carb sync 82 KZ440

I'm helping a buddy of mine tune his carbs. I've synced my carbs on my GS850 using ports on the intake boots and a carb sync tool but it's not clear to me how to perform a vacuum sync on these keihin carbs. What ports on the carb bodies do I hook up the sync tool hoses to? Thanks in advance.
-Smellii

Use the port that the peacock vacuum hose is installed on and the same port on the other carb.