Ducati Monster 796 Workshop Manual page 272

Diagnostic instruments
Note
The on-screen icons used during this procedure are explained in a table at the end of this section.
Engine performance is directly correlated to the pressure that can be measured in the combustion chambers of the two
cylinders. Pressure which is too high/low or an excessive difference between the two cylinders will cause a drop in engine
performance and can cause engine breakdowns.
Run the engine so that it warms up to the point that the fan is tripped at least once.
Remove the HT leads (1) from both spark plugs.
Remove the spark plug from the cylinder to be tested.
Position the HT lead carefully to avoid sparking.
Screw in the spark plug housing the cylinder compression cable (2) part no. 552.1.038.1A.
Connect the pressure sensors (3) part no. 552.1.039.1A to the cable (2).
Turn on the DDS diagnosis instrument (4) referring to the paragraph
Connect the power and diagnostics cable (Measurement Module) (5) part no. 97900.0222 to the measurement module
connector (B) on the DDS diagnosis instrument (4).
Connect the pressure sensor part no. 552.1.039.1A to the jack (A) of the cable (5) part no. 97900.0222.
Note
Measure the compression on one cylinder at a time.
"Connection to the motorcycle".