To setup your iEFIS and iEFIS Lite display (when using standard screen layouts - not custom) for the engine you have (example Lycoming 4/6-cyl, or Rotax or Jabiru/other 4/6 cylinder) and to setup the number of fuel tanks you have and whether you have fuel pressure/flow or not, use the Standard System Selections:
Go to MENU > SYSTEM SETUP MENU > STANDARD SYSTEM SELECTIONS
Then, to use the best default screen designs, select Engine Horizontal Panel
Select Flight: COM 1 radio and transponder for best default layout
Engine: Toggle through until you find an engine that represents your installation
Fuel: Toggle through until you find the correct Fuel Level, fuel flow and fuel pressure selection
Note: if you get the message "Not Available in Flight" please see this article.