Question id 199 - Aircraft General Knowledge - Instrumentation - ATPL - Airline Transport Pilot license

Fan rotation speed (or N1) or the EPR (Engine Pressure Ratio).
Fan rotation speed (or N1) or the total pressure at the low pressure turbine outlet.
Fan rotation speed (or N1) or the total pressure at the high pressure compressor outlet.
High pressure turbine rotation speed or the EPR (Engine Pressure Ratio).