To be certain:
* Consult a repair manual specific to your 1998 Corvette. This is the most reliable method. A Haynes or Chilton manual will have diagrams and precise locations.
* Use a parts diagram. Many online auto parts stores (like AutoZone, Advance Auto Parts, etc.) allow you to look up your vehicle and see parts diagrams. Find your engine and look for the oil pressure switch.
* Visually inspect the engine. Look near the oil filter and along the driver's side of the block for a small switch with a single wire. Be careful and avoid touching hot components.
Remember to always disconnect the negative battery terminal before working on any electrical components.