Losing engine gauges, speedo, and fan staying on

[Colter]

This would be a fun one to find, elogs are always terrible at codes, I assume one tank guage isnt working. Without a 1117 you ECM power supply should be good, the fact the the ABS seems to be flagging a voltage issue opens up the rest of the wiring.
Just for giggle does your battery box have a fusible mounted at the rear with a smaller cable? If so is it corroded? Also when it does rear its head does your voltage guage do anything weird?