Need wiring help on 72 Scamp 318 auto

YES. mistake By the way there' s a 72 factory shop manual on that site (which came from here!!!) via AbodyJoe

(Starter relay is yellow), horns green / red)

I think if you drop back to the '70 shop manual (also there) it was correct, but not sure.

You will have to be wary of the bulkhead terminals but I believe L is the horns, T is the start wire