Here's an old, old post on my system. May give some ideas. Seems like there are a lot of better thoughts here now. Back then it was "innovative" (like 8-track stereo ) Still working well, though.
http://www.peachparts.com/shopforum/showthread.php?t=55188&highlight=low+oil+pressure+switch)
Post #7
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The Golden Rule
1984 300SD (bought new, sold it in 1988, bought it back 13 yrs. later)
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