I did like post 21 by funola. I removed the EGR Box since all the vac parts were suspect and thus removed. My problem was the OVP Relay (not it's fuse atop), which is only used for the EGR Box. Those are expensive to replace, so I just tossed it and the box. For those readers jumping in here, if your tach stops working in a 1985, you will lose AC since the Klima relay requires that signal. It routes thru the EGR Box. I think 1984 is the same re fixing the dash tach, though doesn't have Klima for AC.

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1984 & 1985 CA 300D's
1964 & 65 Mopar's - Valiant, Dart, Newport
1996 & 2002 Chrysler minivans