Paul:
Somewhere on this board a few months ago I posted a very similar problem with my rear oil temp for my normally aspirated 337A. Turns out it was the probe. If you search this board, I think I put a somewhat detailed description of my readings on the ground, at altitude, and after landing.
Naturally, you'll want to conclude the rest of your testings, but thought you may want to know.
Keven
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teen girl Cams