* Oil Pressure Switch: This is usually located on the engine block, near the oil filter. It's a small switch with one or two wires connected to it. You'll likely need to look closely around the oil filter area to find it. A wiring diagram specific to your year and engine would be most helpful to pinpoint its exact location.
* Fuel Pump Relay: The fuel pump relay is usually located inside the under-hood fuse box (also called the Power Distribution Center or PDC). The fuse box is often located near the battery, but its exact position can vary slightly. The relay itself will be clearly labeled, or you can consult your owner's manual or a wiring diagram to identify it. It's often a standard automotive relay, easily removable.
Recommendation:
To be absolutely certain, I strongly recommend you:
1. Consult your owner's manual: This is the best resource for the exact location of these components on your specific vehicle.
2. Use a wiring diagram: A wiring diagram for a 1993 Chevrolet S10/Tahoe with the 4.3L V6 will precisely show the location of the oil pressure switch and fuel pump relay. These diagrams are available online through various automotive parts websites or repair manuals.
Looking at images online of the engine bay and fuse box of a similar year and model might also help you visually locate these parts. Remember to be cautious when working around the engine and electrical components.
