Brian,
I now see the diagram you posted earlier that appears to come from a file with the HTML address of: http://home.comcast.net/~phantoms/vacuum/egr_82_300d.jpg that I'm guessing is a personal WebSite of some sort... and although Brian's diagram is named as though it is for a 1982 300D "EGR" system, it appears to be all but identical [except for how the text legend is formatted ] to the one at:
http://www.peterschmid.com/vacuum/1977_1985/617_95/1981_1984.jpg. This latter diagram is for 1984 "Federal" and 1983 CA cars with 617.95 engines and is labeled as such right in the graphic. Brian's diagram has no application lable on the file's graphic.

Most important, I notice that Brian's diagram has considerably higher resolution which gives better clarity.

Brian - can you tell me the original source for your diagram?... also I'm puzzled as to how you were able include such a high resolution graphic right in the body of your POST? That must be the "Attachment Management" feature that is titled "Upload file from a URL"??

Sam