This listing is for 1 new 1/8" NPT oil pressure sending switch to fit Pontiac vehicles listed above. This switch uses fine threads. If you need the larger 1/4" NPT size threads, we have them available in our eCRATER store. This switch is used to control your oil pressure light or oil gauge depending on the vehicle. Replace your leaking oil pressure switch with this new OEM unit. WE SHIP WORLDWIDE!!!