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The outer casting (Jacket) of the boiler doesn’t tell you which one is “bigger” for that you need to read the BTU input.
Depending on how these boilers are hooked up whether you need to fire one or both.
For example my home is 2 stories not including full basement and I have 2 boilers.
The “smaller boiler” heats the upper floor 12 rooms and the bigger boiler handles the lower floor 11 rooms plus the basement.
The gage you describe is combination of pressure/altitude gage.
The black arrow is the cold fill pressure (height/altitude) normally set between 23 ft-
The RED part is your pressure gage red lined at 30 PSI.
The cast iron radiators will give you a much more uniform and Quiet heat compared to copper fin tubing.
I would how ever strongly suggest you hire a licensed Master plumber (ask to see the license) and have him/her go over these boilers with you.