Tail lights and cluster light wont come on?

Check for power in the fuse panel at the tail fuse, and for power and bad connections at the headlight switch connector.

The dash problem is surely related, "it's a trick"

In order for the dash lamps to work, the tail circuit must have power

Power goes through the dash dimmer control, OUT to the fuse box through the tan wire, and through the inst. fuse and out to the dash lamps on orange wiring.

So in order for the dash lamps to work, the tail circuit must be live, firstly.