What is the difference?

What is the difference between the 1972 A-body dashboard wiring harnesses? A running change was made in November 1971. For those with failing memories, and those who were too young to appreciate, there was a lot of nonsense going on at the time with regards to cars and Federal, and California, regulations. This was about the time that we got EGR, seat belt warning buzzers and lights, catalytic converters, the notorious seat belt/ignition interlock, SAE net horsepower, unleaded fuel, and the first Arab oil embargo. On the A-body there are three standard different instrument panels. Gauges were the same but one had no warning lights apart from the instrument cluster, another had one light and another had two. What did the warning lights not in the instrument cluster say. I thought one read "Fasten Seat Belts" while another read "Check EGR". Do any of the FABO members recall what the lights were for. I have one with a single hole, with no lens. Think I will work something that when a part throttle downshift occurs it will read "Shut Up Hang On."