Fender Mounted Turn Signals

I have a 68 Dart GT that is fitted with Fender Mounted Turn Signals.
All of the system works fine including the flasher unit, but the instrument panel indicator lights (left and right arrows on the instrument panel) dont work.
I pulled the dash and found that the plastic light fittings arent in the panel on the pcb. They are taped over from the factory, so they were never fitted.
Has anyone else got a Dart with the Fender mounted Turn Signals, and do the turn signals on the dash work or is this normal? :dontknow: :help:[/QU