From the damage screen. The engine items listed, from top to bottom in the damage screen will be listed in the order they are defined in the units..upc file. So if the upc file adds;
[UserPlayerUnit 1.Compartment 2.EquipmentSlot 2]
ID= EqSlotDEPF
NameDisplayable= No 1 Main Engine
Type=NULL
AcceptedTypes=GatoDEngine
UserCustomizable=No
IDLinkEquipmentIntervalDefault1= NULL, NULL, GatoDieselEngine
ExternalNodeName3D= NULL
ExternalDamageZoneTypeID3D= 21
[UserPlayerUnit 1.Compartment 2.EquipmentSlot 3]
ID= EqSlotDESF
NameDisplayable= No 2 Main Engine
Type=NULL
AcceptedTypes=GatoDEngine
UserCustomizable=No
IDLinkEquipmentIntervalDefault1= NULL, NULL, GatoDieselEngine
ExternalNodeName3D= NULL
ExternalDamageZoneTypeID3D= 55
[UserPlayerUnit 1.Compartment 2.EquipmentSlot 4]
ID= EqSlotDEPA
NameDisplayable= No 3 Main Engine
Type=NULL
AcceptedTypes=GatoDEngine
UserCustomizable=No
IDLinkEquipmentIntervalDefault1= NULL, NULL, GatoDieselEngine
ExternalNodeName3D= NULL
ExternalDamageZoneTypeID3D= -1
[UserPlayerUnit 1.Compartment 2.EquipmentSlot 5]
ID= EqSlotDESA
NameDisplayable= No 4 Main Engine
Type=NULL
AcceptedTypes=GatoDEngine
UserCustomizable=No
IDLinkEquipmentIntervalDefault1= NULL, NULL, GatoDieselEngine
ExternalNodeName3D= NULL
ExternalDamageZoneTypeID3D= -1
Then if the damage screen shows damage against the top 2 engines, that's 21 & 55 taking hits for you. If however the next two engines are taking damage - the -1 for the damage zone means they are showing damage because the parent (the engine room compartment - usually zone 29 or 201, is taking damage). I believe the stock config is for zones 21 & 55 to have a parent of 29. So if your sub has an engine room damage zone of 29, when that is completely destroyed, then both 21 & 55 will also be destroyed.
If 29 is taking damage and is NOT destroyed, and 21 & 55 are untouched this should have no impact on propulsion.
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