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A word of caution, if they changed connectors, the books may not be correct as the manufacturers will use what they have until they run out. So because another 77 has one connector doesn't confirm you have the same. Unless the switch was made a couple of years earlier. 2 trucks could have the same build date from 2 different plants and come with different parts.
That's what I was leaning towards. It looked the least complicated, and my truck is as simple as they come. Lord knows I have been upside down under that dash enough times trying to unfubar the previous oners wiring, and I thought that's I remember seeing. It has turn signals, horn, and hazards on the column and nothing else.