I have a VDO sender and Dynon 150 display on my 3300.  Oil Temps read normal until I reach 170-190 F; at that point I get continuous, instantaneous fluctuations between 170 and 220..  Fluctuations go away when the temp drops below 170. I've replaced all connectors.  Anyone else have this problem?  Solutions? 

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Seems strange that the sensor would do that but that is what I would check next.  You could remove it and check its resistance while heating it in water brought to a boil.


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