Buckshot,
It is possible for the TZT2 systems to display engine data. Can you confirm if your engine is able to output its data in J1939 format? If so, you will need a J1939 to NMEA2000 data converter. That will put the engine data onto your NMEA2000 backbone.
Many of our customers have used Maretron for this. I have attached some information about the data their converter provides.
StoneFly