Successfully installed timing chain &rails 500sel

Thanks to the people on this board, especially Steve Brotherton and Mike Tangas, I was able to get my car running(it took me almost a week). Today I drove at least 200 miles. The car runs great except that somehow the vaccuum guage on the dash doesn't work now. I think I connected all the lines properly-
obviously not!! Does anybody know where to look for the guage connection under the hood? Thanks
Woody