just bought a 72 chevelle. None of the dashboard lights work. Fuzes are good. Is there a single source feed to the dash I should be looking at? Any other ideas?

There ae a couple possibilities. The light switch and its connector, the instrument cluster connector, or,
like the one I worked on, the bussing connections behind the fuse panel on the INST fuse.

http://www.wwdsltd.com/files/1972EFIFusePanelInstalledSm.jpg

Your's probably won't have the extra four fuses on the right unless you've installed an EFI engine like this one:
http://www.automotiveforums.com/vbulletin/showthread.php?t=967713


This might help:

http://www.wwdsltd.com/files/1972A-BodyDiagram.jpg