| >Also, it appears that I have some type of finned alloy oil pan that drains
>from the rear-center.  It also has a plug in the side about mid-way up
>(possible oil-cooler inlet?).  I would guess this is some sort of
>after-market rig but have no idea where it came from.
I have a thermocouple-type oil temperature gauge in a box out in the shed. 
The thermocouple part is threaded and I was told that it goes into the oil 
pan. I bet that it goes into your hole about mid-way up the finned alloy 
pan.
Only I don't have a finned alloy oil pan to put it in. Oh, well...
John
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