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You should have fairly accurate readings if your sensor on the oil cooler is on the "Hot" side (shown where the red arrow enters the cooler on this diagram):


http://www.scienceofspeed.com/products/engine_performance_products/NSX/ScienceofSpeed/oil_cooler/


If your sensor is on the opposite side, then it's not very helpful.  An easy fix would be to swap the lines so you're measuring the temps pre-cooler.


Measuring the temps in the oil filter sandwhich plate should also be a fairly accurate reading if you're reading the oil on the outside of the sandwhich plate which comes directly from the oil pan (the red lines on that SOS link).


Yes when I said "sump" I meant the oil pan.  Measuring at the accusump would be even more useless since the valve opens and closes.


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