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If it was just the oil pressure freaking out, I would say it is the oil pressure sending unit (and maybe it IS...could be your temp fluctuates like that all the time, only you never noticed?). But if the temperature is fluctuating ABNORMALLY also, I would suspect a real oiling problem due to either a clogged oil filter or a failing oil pump. I would change the oil filter and see what it does then. Do not overfill the crankcase with oil---you'll blow out seals and create massive oil leaks.
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