I’m in the process of rebuilding my cluster and have found the old diagram to be less than helpful (shown at bottom). So I went through the trouble of testing every pin and reviewing against the diagram. Viola - I’m pleased to provide an updated diagram for anyone in the future who would like a harness-view diagram. Let the record show that I’m 99% sure about this
What about Seat Belt light? The '73 has it in the instrument cluster. Maybe it just connects to Ground (?)...
There is an additional light located between OIL and ALT on my gauge but it wasn’t part of the harness. I’m not sure if that was some alteration by a previous owner and it should have been part of the harness? Anyway, it had 12v key-on and a ground so it lights up when you are starting up the vehicle and I suppose it acts like a seatbelt light. There are no words or symbol on the gauge though.
