To be certain, you should:
* Consult your vehicle's repair manual: This will provide diagrams and precise locations.
* Use a visual inspection: Look closely around the oil filter; the switch is often a small, cylindrical component with a single wire connected to it. It may be difficult to see without removing some components.
* Search online for images: Search for "200[year] Pontiac Grand Am 2.4L oil pressure switch location" (replacing "[year]" with your car's year) on Google Images. This may give you a visual reference.
Caution: Be careful when working near hot engine parts. Allow the engine to cool completely before attempting to locate the oil pressure switch.