When you create a new audit using Audit Wizard you configured the Base station and loggers that would be used during the audit.

On the logger configuration popup there's a check box option to indicate that the logger being configured is used to log system pressure.

Observe that...

• If you do not check this box and there is only one pressure logger present it is assumed that this logger is 'system pressure'
• If you install more than 1 pressure logger and you do not check this box SCADAR.NET will assume that the first pressure logger in the audit configuration is 'system pressure'.
  
• Only one pressure logger is the system pressure logger
• The last pressure logger chosen as the system pressure logger (check mark on) takes priority over any previous configuration