Power from Taillight is wired to fuel sending unit... Check!

Here's a couple of ideas to start with for the 74 column side.............

From 79 pickup wiring (top), and from 73 B / C body (bottom) you can see these are very similar

(I posted the 73 as it's close to the year of the column, but shows up what you are against......some color changes "maybe"

The hazard flasher feed changed from pink to light blue

I think what is marked "side lamp" should read "stop lamp" both years white

Note the color change on left and right front

This is the kind of thing you will need to work out, and we can help with that, but it would REALLY help if you could find the proper diagram to match your steering column