SUCCESS!
Replaced the alternator yesterday and voila, my oil temp gauge no longer goes to max!
The stickers on my old alternator did show it was the proper 150 amp unit intended for the M so not exactly sure what was wrong with it. I still find it so odd that it was pumping out a consistent 14.1-2 volts as it should have yet would trip up the gauge. In either case, I'm just glad this gremlin is no longer around.
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