Please forgive me Gentlemen. Is the oil pressure switch another name for the "sending unit"? If so, do I go with the $25 or $50 part (1987 Mercedes-Benz 300TD Base Wagon - Oil Circulation - Page 2)

If these are not the part, can someone please point me in the proper direction?

Lastly, as I just picked up another 603 engine, should I replace the units in both just to be safe? :-)

Thanks for sharing the expertise!!!

glenn

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1988 300 TE - Schnitzel (Daily Driver)
1995 E300 - Betty (Son's Daily Driver)

1987 300 TD - Kraut (Dropped a valve)

1987 300 D - Hans (Need to rebuild engine)