some Duster gauges not working?

so will that affect anything then?
No. Like I said, the 5th wire and half of the dual ballast resistor was deleted. no longer required. The 5th wire just dead ends in the connector where there isn't a contact pin for it.
As for the gauges, I really don't know what to tell you. Your gauge voltage limiter is plugged in at very top center on the backside of the inst' panel. Pretty much impossible to R&R without pulling the panel out some distance. It is also throwing anywhere from 30 to 60 dollars at the problem without diagnosis. Doesn't help the amp gauge issue either. We could help you with diagnosis but first you must have a decent multimeter and a few jumper wires with alligator clips both ends.