Instrument panel help??

Is the panel still attached to the dash with screws / It needs a chassis ground.
If you're outdoors in sunlight the dash lights may be infact working. If you know for sure they aren't working the problem could be the dimmer reostat in the headlight switch or the bulbs. Sylvania 2825 is a good replacement for those.
The gauges operate on 5 volts supplied by a mechanical voltage limiter on the back of the panel. There is no fuse in the 5 volt circuit or in the 12 volt supply to the limiter.
That 12 volts comes directly from the ignition switch. The hand brake lamp is on the same 12 volt source. If it works the limiter is getting 12 volts too. Doesn't mean it sending the pulse voltage out though. Pilse voltage would show as 2.x 3.x 2.x on a digital volt meter to average 5.x volts. Hope this helps