I recently looked at a chevelle SS that was for sale. although it was not a matching #,s car when I stuck my head in and saw factory gauges. I noticed that it had a 6,000 rpm redline tach. I have also seen a few others over the years. I also have an old magazine called "musclecars of the 60,s and 70,s". it is the july-august of 91. issue. it features a 16,000 mile matching #,s original SS 396-L78. It shows a picture of the gauge cluster and I quote from the text"Surrounding the 7,000-rpm tachometer are battery,gasoline,engine temperature and oil pressure gauges. redline was notched at 6,000 rpm" good luck