Each section of the cluster is fed power to the lights from separate pins on the PC boards. You can just look at the traces on the board and figure out where they go. Do you have a multimeter/ test lamp? How about some "clip leads?" (Alligator clip wires?) You need to "rig" it up and check it out. The dash dimmer controlled lamps are fed by orange wiring from the INST fuse in the fuse panel
