To be certain, you should:
* Consult a repair manual: A Haynes or Chilton manual specific to your year and model truck will have diagrams and detailed instructions.
* Use a parts diagram: Many online auto parts retailers (like AutoZone, Advance Auto Parts, etc.) have online parts diagrams. Find your truck's details and look for the CMP sensor. The diagram will show its location.
Remember, working on a diesel engine requires some mechanical knowledge. If you're not comfortable doing it yourself, it's best to take it to a qualified mechanic.