Hi its the inhibitor switch and reverse light switch all in one.
It,s got a black rubber plug going onto it just under the N/S driveshaft(passanger side).
You will need a 19mm spanner to undo it and remove it,it sits below the oil level so it will leak a lot of oil when you remove it.
When replaced check the oil level with the engine running in park,i would advise you fill it to the max mark even when cold as it will drive better,it will not do any damage what so ever.
Richard
rbtrans@btinternet.com
Richard, July 2007