Ducati Monster 795 Owner's Manual page 85

Release the lambda sensor cable (L) from the tab (M) on the
E tank flange cover.
Warning
Before removing the flange cover (16), make sure the
tank is empty and position a rag to collect any spilt fuel.
Hold the fuel tank in a raised position and remove the flange
cover (16) by unscrewing the nuts (17).
84
L
M
fig. 75
16
17
fig. 76