The transfer case lever rattle/vibration is pretty annoying. It goes away with simply holding a finger on top the lever. so I took one of the rubber bracelets that various organizations dish out for free at community events, and put it around the shift lever and transfer case lever, creating...
I've got 4 sets of these cabelas seat covers on different trucks. The material is tough and lasts a long time. They fit snug when installed correctly. Repel water. They are a little bit of a trick to take off and wash, but once a year usually is fine.
Ambient air temperature sensor
Here is an ambient air temperature gauge I put on. I didn't mount it in a permanent manner because I didn't really want to take a Dremel tool to the metal on the dash... Plus, it is operated on a small watch battery, and the backside will need to be accessed...
gas cap
tired of driving off without my gas cap. i put a zip tie through the top and it hooks on the lock mechanism so you can't shut the gas door without remembering to put the cap back on.
next to free.