Larry,

Maybe there is a reason your shifting world might be reversed?

Powerglide indicators and Hydra-Matic (not Hydro-Matic) indicators had the gear indicators in different sequences.

Some Hydra-Matic indicators with name/title on them
Some Powerglide indicators

4 forward gears on 1953-55 GMC/Chevrolet Hydra-Matic?
2 forward gears on Powerglide?

Maybe a former owner had to replace the indicator and mounting the wrong one in reverse was "helpful"?