The previous owner more than likely sold the car before investing in the oil leak repairs at the Valve Covers. Expect to cough up some sizable coins to address it if they are leaking.
The oil sending unit is located on the oil filter housing, and that is located on the front driverís side of the engine. At the moment I am unable to recall the access to the sending unit but I believe it is relatively straight forward. You may need a crows-foot wrench to replace it and you want to replace the unit while the car is on a lift.