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The TZL12F NavNet by Furuno says in its specifications that a 50/200kHz transducer is what it requires for fishfinder capability... and, that the transmission power for its sonar connection or transducer connection is either 600 W or else 1 kW.
You would really have to give me a brand name, at very least, or a vague description too (e.g. transom-mount, or not, etd.) for your transducer, for me to be sure that it could be used with the TZL12F... or not. The data given so far is not sufficient for me to say one way or another, yet.
As for an NMEA 0183 output being converted to NMEA 2000, that's easy, here are two converters that do that for you:
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Which fishfinder features do you want to be sure will work?
And is the transducer a Furuno, or some other brand, please?