Resolved: It's a vent hose that means nothing. Good advice in this thread though.

Everything went smoothly...except one thing. There's a ?vacuum? hose left over. The Bosch pump has the coolant lines in the front and then on the back is a small rubber hose, that DOESN'T hook up anywhere on the Johnson. The instructions I found here looks like it just dangles there afterward.

And I lied about it going smoothly...it was a pain in the *** lol. The directions are pretty good except:

It doesn't address the rubber hose (for the love of God what am I supposed to do with it?!)
If you do this, have a plan for how to attach the pump. I don't have a good way to do it, I drilled a hole, used a nut/washer/bolt and swore violently while using a set of 3" wrenches to attempt to tighten it since the mount has to be bolted on before the pump goes on. Hopefully someone can put forth a good plan for this.

It's till better/easier than taking it to the dealer. Lastly, screw MB for building a car with super crappy jack points...I hate you.

No longer having to wonder if I'm going to have supercharged funtime or Civic towing a travel trailer when hitting the gas still trumps all this