Because the exact location can vary slightly depending on the specific model and modifications, it's best to:
1. Consult your owner's manual: This is the most reliable source.
2. Use a repair manual: A Haynes or Chilton manual for your specific year and model will have diagrams showing its precise location.
3. Look at online forums: Search for "1998 Dodge Ram 1500 5.9L IAT sensor location" on forums like DodgeForum.com. Pictures posted by other owners can be very helpful.
Remember to be cautious when working near the intake system, as there are moving parts and hot surfaces.