Oil pressure sensor Location?

What im thinking of doing now is taking out the line/unit and plugging it up filling it up with oil and seeing if any damage was done(see if it runs) and or burn off all that oil ive not wiped up..anyone know what size thing(plug?) id need to put in seal up that oil sending unit hole? or if I go explain what i want to do would they know at the place( a autozone or westernauto or the like)?