Measured a set that I had on the shelf, 90 mph so they must be
out of a '52 or '53 wider tabs at the bottom.
Found this at JC's site:
http://www.oldchevytrucks.com/blog/...l-articles/1947-55/speedometers-1947-55/
1947 was square around 4 3/4". 1948 up went to just under 6" at
the bottom.
Denny Graham
Sandwich, IL


Denny G
Sandwich, IL