68 Barracuda Instrument lights not working

Just purchased a 68 Barracuda Convertible. Headlights work but no dash lights. Getting power on both sides of the fuse. Tried the dimmer on headlight switch but no lights. Car was restored 3 years ago. Guy who restored it said dash lights worked leaving his shop. Plug behind cluster appears tight. All gauges work. Blinker lights work. Any suggestions?