Mine is a 2013 model and does not have a climate control switch in the freezer, you must have a different model than mine also the plastic piece in your photo appears to be longer than mine. Is there a sticker on the wall (inside) next to the fins that shows 'colder - warmer"? If not my guess would be attach the sensor with the plastic piece on the fin and do your 'climate control switch to attain the results you want again just guessing at this point.
Dale & Terri, Lulu & Tiki (our Chihuahua's), New rescue puppy Prince - Pom/Pug mix.
2013 Tundra, Double Cab, 5.7, TRD Off-Road, 4X4, Full Tow Package
2013 Wildwood T26TBSS - Sold
2000 Gulf Stream Sun Voyager M-8357 MH, Ford Trident V10 Gasser, 35 foot.