Well FWIW regarding the oil temp sensor accuracy, my oil temp used to rest at 220-225*F when driving and spike up to 250 pretty quickly during aggressive city driving (mostly due to higher RPMs).
After adding an oil cooler kit with a thermostatically controlled plate set at 180*F, my oil temps seem to rest at about 185*F when cruising around town and about 195 on the freeway. They go up to about 220 during aggressive driving, but that's as high as I've seen them go so far.
The important clue here is the oil cooler sandwich plate is set at roughly 180*F, and I see my oil temps rest around 185*F. Without having an intimate knowledge of how the oil plumbing works inside the oil pan, to me, that says the temp sensor is likely accurate.
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