Ok,,,
All turbos from 85, Federal
All turbos from 84, California..

Looks to be located on the inner firewall between the climate control amplifier and the multi use relay (behind the glove compartment area generally,) 5 spade connectors..
Good luck on what they look like... that is my best shot..

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1980 240d ,

chain elongation, cam marks reference:
http://www.peachparts.com/shopforum/showthread.php?threadid=10414

http://www.peachparts.com/shopforum/diesel-discussion/305365-9-degrees-chain-stretch.html

evap fin cleaning:

http://www.peachparts.com/shopforum/showthread.php?t=156207&highlight=evaporator

A/C thread

http://www.peachparts.com/shopforum/diesel-discussion/297462-c-recommendations-mb-vehicles.html