can you help me identify these parts

[oldno7]

http://67-72chevytrucks.com/vboard/a...2d=13659908022
So here they are the first one i was told is some kind of a gmc dash, The second is a dual air gauge from prob a big truck, The third is some kind of badge, but not sure what it would of come off of, The last i don't know what this came off of . The fella is 84 years old and has 50 plus years of stuff mostly bigger trucks like c-30's and bigger. He has mirrors gauges dashes lights prob just about anything you came imagine. I think i have hit a honey hole, just wish it was for c-10's. oldno7