You have to get the transmission info on the transmission plate.
Think about the work the engine does and about how it relates to the transmission.
The work the engine does relates to the rpm, transmission, prop diameter and pitch.
The work the engine should do is related to type of hull, length, beam, and tonnage.
I the "does" is more than "should do" you'll be seeing black smoke soon (if you have a diesel) that's a sign of asking too muck work from the engine
Most prop places have a computer program now that needs these inputs.
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