Electrical problem
2005 Chrysler Crossfire 6 cyl Two Wheel Drive Automatic 32950 miles

I just recently got a 2005 Crossfire Convert, and the external out temperature reads -36F on my inside gauge. The Dealer I got it from ordered a new sensor and installed it. It has been a week, and it's still reading -36F. Where is this sensor located?
Any help would be more then greatly appreciated.

Thanks