2.7t oil light on dash ( red )
 

I was driving my 2002 Audi A6 2.7 next to a friend punched it ( I have a boost gage installed ) notice my car hit 12 psi an next thing I knew oil pressure light was on pulled over shut car off immediately looked underneath no oil residue check dip stick it had oil restarted the car no oil light drove it home reaching regular boost and step on it an no oil pressure light coming on anyone have an idea what possibly could of happened thanks you