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Now, as for your question; I just took a quick peek in my Chilton's manual for the Ranger/Bronco II and it has some decent vacuum diagrams, including the one for your year and model. It's well worth it to pick one up anyway. They're about 15 bucks or so at most auto parts stores. Looking in my Haynes manual, I don't see it listed in the index so if they've chosen to include that information, they want to make you search for it. Part of the reason I prefer the Chiltons.