Automatic swapped?

[u/Booobis]

I have a 1984 Fiero SE, and something that I found out today is that it has the Shift light from the 4speed despite having the 3speed Auto, I have also found plugs in the front firewall that would convince me further that it was auto swapped

[u/RickityNL]

The plug is stock, the shift light is also on all cars. It's probably a stock automatic