I have a question regarding the TPMS on my vehicle. I am going to swap out wheels on my vehicle from the stock 17" wheels. I don't know however if I have TPMS or not. It looks like I just have the rubber valve stems and read a post saying if they are rubber then you don't have TPMS. However on my message center in the vehicle between the speedo and RPM, when I scroll through it there is an option for a "run flat indicator" Then I think it says you press + to activate. When I press + it says it is activated. This makes me think the sensors are there? If someone could clarify I would really appreciate it. Also what other items will I need for the wheels to be swapped out? If it does not have the sensors then is it just a standard tire swap? Thanks in advance.