It should be pretty straightforward. Just follow the connections described in the wire diagram.
The rear should have orange and green (or black wires with a green ring) for one side, and Blue and green for the other side. Same for the front, but recall that the mounting positions are rubber isolated so there is a green connection to the wire harness green.
The blinkers are powered via a black wire (key switch source) to the blinker relay. The grey wire from the relay routes up to the bar control which distributes power to either right or left bulbs.
Make note of the numbers on the signal bulb bases. I think for 77 they still used the lower wattage 1034 front and 1073 rear. These often get replaced with higher wattage 1157 and 1156 bulbs, which upset the signal flasher's rate of flash.
