1. So I pulled the dash today of my '59 viking60 to replace the nonfunctional lights and the wiper switch. As I got it out, I was noticing and wondering what that thing was right about where the speedo cable attaches. I realized it was a diaphragm and then I saw the unhooked hose. I hooked it up, but have not driven it yet and can't figure out what it is for and have not yet found any info about it on the net or here. I need someone to enlighten me on what that is for.

2. It appears that this old girl has a single speed wiper motor. I just thought the switch was bad and only hi worked, cause when you turn them off they seem to park at low speed. I only have two wires running from motor to switch. Is this correct that they have single speed motors?

thanks for all the incredible information y'all