Game version: 0.6.2.6
The O2 Pressure Alarm is not accessible in default salvage pod model - pathing is blocked by the Nav Station and N2 canister.
1 unmount upper N2 canister
2 do what you need to do (for example, unmount O2 pressure sensor)
3 mount upper N2 canister back
4 ... (by the way training skill mount\unmount)
5 PROFIT!!! =)
but I think the initial boat can be forgiven for the cramped conditions. you just grab a slightly larger ship - and the problem is solved