I had just put on 20" rims and the shop did took out the tire pressure thing.(I dont know anything about this) Everything was fine on the drive home but when i was almost home the TMPS came on what do i do?

I have a base model rdx 2007

 

there could be a couple of reasons why the light is on:

*did they even install the TPS
*did they damage it when installing it back into the 20"
*theres a leak