Updating the ignition switch question. The 71 and 72 ignition switch wire color codes are the same so you do have the original 71 wiring harness. The orange wires should mate with each other. The orange wire sends power to the gear selector display light on the column. There should be 2 red wires coming out of the column that connect to the 2 black wires from the instrument panel wiring harness. The red wires go to the key warning buzzer.