No less than five speedometers were used in Chevrolet trucks during the Advance Design years, 1947-1955. If you want your truck just right, be sure you understand the differences. Restoring one you have on a shelf or purchased at a swap meet may not be proper for your year. The following will provide a description of differences.
Red-Orange needle. Lower two tabs 4 3/4″ apart. 80 MPH (A clear needle means the color has faded away.)
Red-Orange needle. Lower two tabs 6″ apart. 80 MPH
White needle, lower two tabs 6″ apart. 80 MPH
White needle, lower two tabs 6″ apart. 90 MPH
Totally different from earlier years. Silver needle over black face. Few parts interchange
Then there is the GMC speedometers used during 1947-1955 (Only 1952-1953 are the same.) That is another story!