the bottom set is a 1970 CB450 twin set. 1968-1970 are the only years the speedo was on the right hand side of the bike and I did own a 1970 cb450 parts bike so these are probably from that.
I think the top set is CL350 from about 1969 or so. The bracket is an early mounting bracket but the redline on the tach looks to be from about 1971. I may have to take it apart for the part numbers. not sure though.
still have no idea about the middle one.