wire question

Hi everyone I was just trying to clean up the wiring on my 1972 duster and I have a question on what a wire all runs to. I have the manual and I can not find in the wiring diagrams I have where it shows this wire coming to and from the fuse block. The fuse block is labeled brake and LP for the circuit in question. It looks like the blue/white wire power is coming from the ignition switch. The diagram does not show this wire going to the fuse block. I can tell you that it goes to terminal 1 of the instrument cluster. It also goes to a bulb (was not hooked to anything) and to what looks like a relay. The wire splices and goes to 5 wires just to the left of the gauges in the wiring harness. I would just like to know where they all go without having to take a bunch apart to find out. Thanks