My current setup is not really factory OEM, so showing pics would be confusing.
It’s rather simple though. Your source is one of the hard nipples on the vac tree in the backside of the intake manifold. That line runs over to the EVR and then you run a line back to the EGr.
Supply the EVR with pure vacuum and then it regulates the vacuum to the egr as needed. Nothing complex and it’s separate from other systems