On my O-200, there is Cessna oil filter adapter behind cyl.1 and oil radiator installed behind cyl.2. Oil temperature sender installed below cyl.1 but someone suggested me to install it on rear of oil filter adapter. I checked oil temperature by external thermometer and I discovered a difference of 20°F more on cyl.1 in comparison on rear of oil filter! Has anyone experience about oil temp. sender installation on O-200? Happy flights for all.