I'd like to replace the tire pressure sensors on both of my SRT6s. What do you recommend for an aftermarket sensor. Are OEM sensors still available? If YES, I imagine they are NOS and the batteries are probably no longer good.

 

These parts were not made specifically for the Crossfire, they may have a Crossfire part number but they could be purchased elsewhere by their OEM makers part number. You certainly do not want to buy them from a dealer using the Crossfire part number, that way you pay the originals price plus a healthy Chrysler mark up.
I have not kept up with these items but I think clones are available which can be set up without a trip to the dealer.
Or you can get rid of them entirely and use the system that uses caps on each valve stem that sends a signal to a screen that gives pressure and temperature at each wheel. That might be worth investigating, cheaper as well. It was discussed here last week.

 

I got a set of Schrader TPMS from TireRack last year.
https://www.crossfireforum.org/forum...highlight=Tpms