Where is the oil sending unit on olds alero 2.4 liter?

The oil pressure sending unit on a 2004-2005 Oldsmobile Alero 2.4L is located on the driver's side (left side) of the engine block, near the oil filter. It's a small, usually one-wire sensor. You might need to look closely and possibly use a flashlight to locate it. It's often tucked in somewhat tightly.