OAT displays wrong values. What to do..??

[ao.frog]

Hi.

I can't get the OAT to show correct values and I think the fault is that mine...?

I have entered two calibration points but the current manual doesn't say anything about entering any calibration points, only to change the shift value until OAT is reading correctly. (Pg 69)

Does this mean that I schould delete my two calibration points, enter 0 in the line for the number of calibration points and just change the shift value until OAT displays correct?
If I recall correctly, an earlier version of the manual said to enter one or two calibration points?

Here's how my OAT calibration screen looks today:



The shiftvalue is set to -6,2 to get the OAT to show correct OAT but regardless of this, the OAT-indication during flight is way too high. For example it indicates -1* C while it's about -10*C outside...


Any ideas anyone?