Yes, 1954/55 Advance-Design ammeters were different from 1947-1953 ammeters AND those two styles of ammeters were located in a different location and orientation in the instrument cluster:

Here are: Chevrolet Advance-Design trucks (1947-1955) ammeters & gauge clusters


The 1947-1954 Factory Assembly Manual is actually a 1954/55 Chevrolet Truck Factory Assembly Manual