2000 cav oil pressure switch oil leak

My sons 2000 chevyhttp://images.intellitxt.com/ast/adTypes/icon1.png (http://www.clubcav.com/showthread.php?p=249663#) cavalier has a oil pressure sending unit (Oil Pressure Switch) leaking oil.It has a 2.2 engine with automatic transmission. I can see that sensor but can not even get my hand on it. does anybody have ideas how to remove it and replace it. I know there is a socket for it. Should I come from the top or the bottom to remove it. thanks http://www.clubcav.com/images/smilies/confused.gif or can I remove something to get up there.

Try this: http://www.autozone.com/autozone/repairinfo/repairguide/repairGuideContent.jsp?pageId=0900c1528003cbbb

Thanks ,but I cannot get to it. the space between engine and transmission is small and I cannot get up between them I was hoping someone could tell me how or what to use to get the switch out of the block.