SUUNTO EON STEEL - Manual (Page 53)

5. After a few seconds, a menu pops up on the screen showing the
Tank POD serial number, battery status and the tank pressure.
From the menu, select the correct gas for that Tank POD.
Repeat the procedure above for additional Tank PODs and select
different gases for each POD.
NOTE: You cannot pair another Tank POD unless you have a
second gas defined in Suunto EON Steel .
Alternatively, you can select which Tank POD to use with each gas
by selecting a Tank POD for the gas in question in the Gas(es)
menu. When using this method, ensure the Tank POD has been
activated by ensuring there is tank pressure reading in screen and
that it is within range. In the menu, the Tank POD is identified by
the serial number printed on the Tank POD.
In the dive main views, only one tank pressure is shown and
corresponds to the active gas. When the gas is changed, the
displayed tank pressure is also changed accordingly.
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