On my 8.3 ISC it is in the wiring loom passenger side of engine just loose, but not sure on yours.
Have you check on the Cummins Quickserve site, if you have a fault code you can do a look up and it will give you detailed instruction on how to troubleshoot and fix.
Somewhere on the Quickserve site I found a document that has a complete description of the engine including sensor location. Also found a drawing that has them identified.
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Jim J
2002 Monaco Windsor 38 PKD Cummins ISC 350 8.3L
2005 Jeep Grand Cherokee w/5.7 Hemi
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