74 dart wiring questions

I have a 74 dart, and the instrument cluster is long gone. I'm wiring up some autometer guages and have figured out that a blue ferrule will plug into the factory PCB connector. I'm using these and my schematic to locate what pins I need but the line on the schematic for spot 4 shows a line that ends with an arrow. It's not a ground symbol and the wire on the connection is a double wire that's orange. Also there is a light blue wire in spot 1 that goes to the voltage regulator and alternator according to the schematic. Is this a switched hot?