"The first bit of info: Don't use MM." WRONG. If you've never had any work done from them, you can't be so definitive. I had them build me a race engine (out of a 2.7) SEVEN years ago, and it's still running strong. There's a lot of BS on the web about them.
Now, on to the issue at hand. What you may be experiencing is a short in the oil sender lead (first place to check) or a malfunctioning oil sender unit (NOT related to MM, mechanical equipment do have failures that are not related to the rebuilder/manufacturer). So, those are the two places to check, as a starting point. Ensure the wiring is in good condition. From your write-up, it seems that as heat builds, so does resistance in your wiring. . .Could be wrong. I only know what I know and don't know what I don't know. :P
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