2002 Chrysler Van Oil light comes on during braking and idl

I just got my 02 Voyager back from having the cracked oil pan replaced. While driving it home, the oil light came on during braking and idling. I checked the oil level, it was fine. It did not have this problem beforehand. If it is the oil pressure switch, I need to know where it is located. If not, than any other ideas. Thanks