Incorrect outside temperature reading

[JudgeM]

Hi all.

I am almost done with my instrument cluster swap.
I've noticed though the outside temperature reading is off. Its strange. It worked initially but now it doesnt work. it seems to be off by 10c. So when its 18c it shows 8c.

Its not the sensor because I changed it and still same problem, however if I wire the sensor directly to the meter, it shows the correct reading.

Any ideas on what I could check ? worst comes to worst I will just wire up an extra sensor directly to the meter, though I'd really like to avoid that.

Cheers