911, what fuse for dash lights?

http://70duster440.com/DashHarness70 Page 2 and 3.PDF

Look at this diagram. Cavity 'F' on the fuse block is the circuit for dash and other accessory lights. The orange wires (E2-18 O & E2A-18 O) are what feed those lamps. Do you have a test light? With the headlight switch on you should have power on both ends of the fuse. If there is no power there then I'd be looking at the headlight switch. If there is power then the problem is downstream of the fuse block. Then check for power at the instruments (orange wire at instrument plug).