If it is an Electronic Engine there should be some type of DATA port some place. It is not an OBD2 connector since it is a truck diesel. My understanding is that they had not standardized the port the until sometime in the early 2000s. It may be up front but also look in the back engine compartment or last compartment on the passenger side. My ports were located in the last compartment passenger side. They were round.
The Scangauge you need is the Scangauge D. That kit has the standard connections (J1939 & J1708) for a modern diesel. If you don't have have either J1939 or J1708 data port contact Scangauge. They will send you the correct data port connection. Since my data port was in the back I had to run a data cable to the front. The data cable was a CAT 5 or 6 computer network cable. Running the cable was the hardest part of the install. The Scangauge allows you to monitor 4 parameters. Getting accurate information well help diagnose the problem.