Be very very careful replacing your TPMS sensors. There are a lot of us experiencing significant issues with after market sensors.
I am taking my car back in this week to have the OEM sensors taken out of my stock wheels and putting them in my new wheels. I put after-market sensors in the new wheels and they simply keep losing their programming with the car's tire pressure system. See these threads for more information:
http://www.camaro5.com/forums/showthread.php?t=89589
http://www.camaro5.com/forums/showthread.php?t=91669
You might want to consider having the OEM sensors mounted inside your wheels instead of getting after-market sensors.