dash lights not working

The fine point that make a difference....
You might have noticed nearly every bulb location has a screw beside it. Those screws are on copper chassis grond contact pads but... They aren't all connected together by the copper traces. This means if you do connect a ground wire at only one of those screws your result may be that one bulb burning much brighter than all others. Why is in the fine points. The aforementioned screws have kep washers against the copper pad. Corrosion on that washer and the copper pad equal less that good conduction. If you will take the time to clean every component in this daisy chain of a ground path you can then attach your actual copper ground wire to most any one of them. I recommend it be attached as low as possible so accidental yank on this wire doesn't break bulb sockets, etc..