Not sure the vaccum is an afterthought as much as 10lbs in a 5 lb bag! I like what Wally did with his as a necessity.
Fuel gauge, I put a new tank in my 77 with all new lines, new sending unit etc. I think I got everything from firebird central but not sure after all these years (I know all the same stuff I got for my 79 came from FC). I have no problem with the fuel gauge. No bounce at all, nothing with corners.
Annoyances=TAC has been working great for me on edge for the last 6 months or so. I clicked on a link yesterday for a long lost thread and BAM back to the what do you call it format??? Now Im back on firefox to log in correctly. Hope it will work itself out soon.