No dash lights

The cluster grounds, originally, and poorly, at the mounting screws. It is far better to add a pigtail from a ground point on the cluster and bolt it to the column support or dash frame

Here is the functional path............

The tail light circuit must be working, the headlight switch routes power from the TL fuse through the dash dimmer control (tan wire) down to the INST fuse in the panel. From there all dash lighting is distributed on orange wires. Does ANY dash light work, like the radio/ heater bezel, etc?