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1997 was a change over year for Cummins , from 12 valve configuration to 24 valve, so wiring on the 24 valve is much more complex.
If you have your engine serial number you could call Cummins Care, for the info.
Engine serial number, is on the , data plate, on the side of the timing gear housing, as per this diagram. The location is the same for both the 5.9 and 8.1 Cummins engines.
99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.