Thought I'd through a dart at the target... I have a 2017 Ram 5500 Laramie that did not have that option, and there might have been a way to get it, BUT, I decided to pick one up on Amazon that also let me add and program trailer sensors, let me program high temp and air pressure alarm and low pressure alarm settings. The monitor has double sided tape and sets in the cover on the center of dash. I don't seem to have pics, so must never have posted about it.
Gupta is the brand on Amazon.
Hope this helps... others may have a better idea. Cheers, Ron