I just used a scotch-lok connector and tapped into the dashboard lighting. It should be an orange wire...
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98. 5 2500, 24v, QC, 4x4, 4. 10 LSD, short bed, Line-X liner, tow package, camper suspension, Westin nerfs, camper shell, TST PowerMax3, 275 RVs, ProComp A/T 305/70/R16s, EGT/Boost pillar gauges... Love my Cummins, no love for Dodge