Sounds like light switch rheostat is not working for the dash lights. Are all the dash lights out or just most of them? If the light switch is good then the dash light bulbs are bad. They are 194's and 168's and they are a super pain in the *** to replace. If you have big hands like me you have to take the dash apart to get to them or if you have a wife or a small kid that can reach down and behind the instrument panel to remove and replace the bulbs. Just about all of my dash light bulbs were burned out after40 years and I had to take the dash apart to get to the bulbs.