Ok , i have see for the hydrophone
1 - no 3d mesh in .GR2 for the light
2 - for the needle there is a dial in QR1.sim
,but we need to see ,what happend with the " spring needle bug " ( when not used by the player )-> in sensors.sim is a dial to "auto rotation " for the hydro antenna and I think the wheel is connected to,but this dial make also hydro search angle too
3 - no idea
4 - idem 3
5 - idem 3-4
6 - no mouse mask in .GR2
to make it workable in game , but we can try to illuminate it in place of the other light