for the door ajar, I'd just spray some WD-40 or PB Blaster on the door latch mechanism and slam the door shut about 5 times, on both sides. I did this on my old truck and it worked for 2 years and then i totaled it :(
gauge cluster, does it just have a black strip where the gear indicator would be for an automatic or does it actually show PRND21? If its just a black strip, thats normal. all manual transmission trucks have that.
I unfortunately can't help you out with the temperature since I don't have the truck in front of me, i don't want to mislead you.
2004 Vermillion Red 4.0 4x4
3" Body Lift
2" Tuff Country AAL
33x12.5R15 BF Goodrich Mud Terrain KM2 on 15x10 Mickey Thompson Sidebiter II
& lots more