9900 gauges not functioning correctly

[DVT873]

AFIK no cab controller on a 9900 unless it is real new. Even then I still think no cab controller but would need to look. HX might have one. VIN would tell. Hopefully maybe just a datalink hiccup. Almost all instrument info comes via datalink from the engine ECM. Fuel gauge and volt gauge are probably direct i.e. non data link. Air pressure gauges may still have actual air line going to them. Instrument cluster will be fused. Did you notice if the fuel and volt gauges stayed normal?

9900's are pretty tough trucks. Paystars (real tough trucks) share much of the same DNA but have heavier duty frames. Cabs, wiring, plumbing very much the same. These trucks, especially the Paystars would not be a good choice for general freight! Should be good or what it sounds like your doing.