Tav
These tachs are untouched. I removed the complete clusters, from two red Cudas in Dobbins Auto Wreckers in upstate NY in 1976.
If I recall, both were 340 4 speed cars and had the two different tachs.
Numbers on the back of these tachs as well as all 7 grand tachs I have and have seen, are all the same 2984185, beneath that is 04091 which I would assume the vendor, then 300532, then 960-BK.
If anyone has anything different on any E body tach, any year, it would be interesting.
Only difference I've seen on the rear is 72 and up sometimes have a date code in larger black letters.