Vacume line from carb to petcock. 2002 kz1000p

So i recently put a new oem petcock onto my bike seeing that the previous owner placed an aftermarket one on there. So the kz1000p has a bank of 34mm mikuni bs carbs. Where do i hook the vacuum line to the carbs? One of the nipples used for syncing the carbs? If so Does it matter which one it is hooked to? Thanks yall !

Yes, use one of the carburetor sync ports & it doesn't matter which one. on most KZs the vac line is connected to the #2 carburetor.