Here are a couple of posts from D300 regarding covert EGR delete.

And now I’m a little worried. His last post was June 17. I didn’t get the impression he was a geezer like myself. I’d hate to see him go.

http://www.peachparts.com/shopforum/diesel-discussion/412477-anybody-recognize-electrical-fitting-top-om603-ip.html#post4171125

http://www.peachparts.com/shopforum/diesel-discussion/412477-anybody-recognize-electrical-fitting-top-om603-ip-2.html#post4171285

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1986 300SDL, 362K
1984 300D, 138K