Ducati Diavel Workshop Manual page 360

Diagnostic instruments
Use the fuel pressure pipe (4) part no. 590.1.189.1A by connecting one end (D) to the coupling of the delivery pipe to
the tank and the other end (E) to the fuel system pipe (3): in this way you create a pressure pick-up socket (F).
Connect the pressure sensor (5) part no. 552.1.039.1A to the outlet (F) of hose (4), in order to convert the pressure
reading into an electric signal.
Turn on the DDS diagnosis instrument (6) referring to the paragraph "Tester power supply".
Connect the power and diagnosis cable (Measurement Module) (7) part no. 97900.0222 to the measurement module
connector (E) of the DDS (1).
Connect the pressure sensor (6) part no. 552.1.039.1A to outlet (A) or (C) of the cable (7).