indicator lights not working

Here's the deal, it's a friend of mines car, B body, 1970 Coronet. He just finished putting it together. All the electrical works fine, headlights, tail lights turn signals, etc. except the indicators for the indicators in the dash for the turn signals and emergency flashers. They work outside the car but just not the green arrow dash indicators. The flasher is new, all the dash bulbs are working???
Kinda stumped, any help is a[appreciated.
Thanks.