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BUSTED! Didn't obey my own rule - CHECK THE TSM FIRST!
Sometimes the info is right there, sometimes as in the case of mine for an '84 it's not (like a complete wiring diagram for my year).
The sender / pressure switch isn't shown in the oil path, BUT - looks like the flow is directly from the sump into the filter, then into the rest of the motor (including running past the oil sender). Is that a correct assumption?
Here's the image of the page from the TSM here in case anyone else is searching in the future: