Anyone recognise this cable?

[Belsh]

So today I've had my first chance to get a good look over the truck and it seems its been cobbled together to sell! Ive found 3 things so far that I'm not sure of hoping you guys can help me out

First 2 pics this cable is connected into the trans casing and the other end is loose in the engine bay. Can anyone tell me what it is?

Also in the third picture is what looks like some sort of vaccum chamber and next to it a pipe with rubber connector on the end. Any ideas?

Then finally in the last pic this was finger tight so I've nipped it up with some grips, is that correct? Be good to know what it is also, I'm new to the mechanics of big american engineering just incase thats not already obvious