What size socket is needed for the oil pressure sender?

I have for a limited time a really good deal on some metric  BIG snap-on
sockets (5$ each! barely used), so what sizes should i get- i was thinking
the oil pressure sender and the front-wheel nut (the big one).
thanks

Matthew Pollard          "Racing with the wind and flirting with death
Dept. Of Chemistry        So have a cup of coffee and catch your breath"
University of Idaho
www.uidaho.edu/~poll7356