e7D can only see one Fresh Water Tank

How many Instances of Fresh Water Tanks can the e7D recognize under the N2K Fluid Level PGN?

My e7D apparently is only able to see one and I have two Fresh Water tanks to monitor on the N2K/STng network. My N2K network analyzer can easily see both tanks properly configured as Fluid Level/Fresh Water/Instance 0 and Instance 1.

If the e7D design fails to support the N2K Standard and can only recognize one, could I configure the second as a Gray Water tank and fool the e7D into recognizing it that way?


Thanks, Lawrence