I cannot say what is what, but there are differences in the fuel gauge faces as to how the fuel levels are labeled - increments? There are common ammeters
that read 20amps, but there are also those that read 30amps - not sure when the change was made? 32 and 33 have terminals to connect the wires, while 34 has a loop that the wires just passes through. That change could have occurred during 33? - we all know that Ford didn't always (ever?) change things at the stroke of midnight between model years...
All this info and detail might be in the new 32 book??? at least as far as what was using during 32. There may be Service Bulletins regarding the change in
the ammeter?
As posted, they all fit the same hole size in the panel...