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This is how I read the wiring diagram. Might start by disconnecting the input to the light switch that comes from the fuse on the CB panel. If that is OK, then remove the output of the light switch to the gauge lights and tail lights one at a time and see if you can isolate the circuit.
The tail light wire should be Black and the gauge wire Black/Red.
The wire between the fuse and the light SW should be Yellow/Red.