1. The F / C change is done from the EFIS > SETTINGS >OAT C/F main menu so you can switch it in flight.

2. Your calibration numbers look about right.

The software does a linear interpolation between the calibration points, using your numbers:


AD-VALUE : 10144
32.0 9571
66.0 10202

It should be showing 63F

Are you sure you are not getting heat from the engine on the probe when in flight?

Have you checked for loose OAT connections?

You might want to try replacing the probe.