No Headlights or dash lights

If the shift indicator lamp, radio lamp, etc,, are working, the fault has to be at the inst' panel.
The park brake lamp and oil pressure lamp ground at those switches so inst' panel ground not required or proven by tose. If high beam and turn indicators work the inst' panel is proven grounded.
Grounding panel to the steering column will work but... if you have to lower the column to service the panel, you'll disconnect your added ground. Better to ground inst' panel at a place that stays put. I routed my ground wire from inst' panel to behind left kick panel. I did add a male/female spade connection about 4 inches below inst' panel so this added wire will unplug like most others.