1963 Valiant~ No Dash Lights???

The dome light circuit is seprate from the intrument lights circuit, even though they are both controlled in the headlights switch.

There should be an INST fuse to check; if that is OK, then most likely it is the dimmer control (rheostat) which is part of the head light switch. (Less likely, all the bulbs are out.) Rotate the dimmer back and forth a lot of times and see if it is just corrosion on the dimmer rheostat.

To repalce the switch, you pull the knob and shaft out of the switch by pushing a small metal button on the under side of the switch; sometimes it takes a few tries.

New switches are not that expensive.