Dear Jean-Pierre and all other colleagues,
the Elevation of the pressure sensor is 'hidden' within the pressure measurement deep in the deployment (Instrument).
This is the value that comes with the legacy report every night and can be found in the download area.
below I took an example (Hahn WIGOS-ID 0-20000-0-10616) and copied parts of the Contents with the Elevation.
Still many stations around the world either miss Station or pressure Elevation but this is part of the process to complete and improve OSCAR's content.
hope this helps a bit,