To find it definitively, I recommend:
* Consulting a repair manual: A Haynes or Chilton manual specific to your vehicle's year and engine will have diagrams and precise locations.
* Using a parts diagram: Many auto parts websites (like AutoZone, Advance Auto Parts, etc.) allow you to enter your vehicle's information and view parts diagrams. Look for a diagram of the intake manifold.
* Online forums: Searching on forums specific to Dodge Ram trucks (like RamForum.com) can yield helpful information and pictures from other owners who've worked on the same engine.
Be cautious when searching for the EGR valve. The engine compartment is hot when the engine is running or recently off. Always allow sufficient time for the engine to cool before working on it.