Sweet. Thanks guys. Once you guys clued me to what it was, I was able to find more info. Good visual confirmation here: http://www.peachparts.com/shopforum/diesel-discussion/185572-1985-federal-300d-tachometer-repair.html#post1481907
Looks like this is a lot more junk I need to remove for EGR delete. It was sooo much easier on the '84... 
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'85 300TD "Puff The Magic Wagon" - Rolling Resto
'19 Mazda CX-9 Signature - Wife's sled
'21 Morgan 3-Wheeler P101 Edition
'95 E300d - SOLD
'84 300TD "Brown Betty" - Miss this one
'81 240D "China Baby" - Farm grocery getter
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