Your Suunto D5 can be used with the total number of three Suunto Tank PODs for wireless tank pressure transmission.
To install and pair a Suunto Tank POD, see How to install and pair a Suunto Tank POD
In tank pressure view you can see the below screens.
The following example has the tank pressure alarm set to 100 bars. The tank pressure is 75 bars as indicated in the switch window at the bottom, and also shown by the blue arrow in the arch. When the tank pressure alarm is turned on, the arch is colored yellow between 50 bars and the value you defined (100 bars).
In the switch window, the actual tank pressure is shown in a blue field by default. This is also shown with a blue arrow in the arch. The blue part of the arch indicates the range between the value you set for the tank pressure alarm and the actual tank pressure:
When the tank pressure alarm is turned on and the value is between the value you set and 50 bars, the tank pressure value is indicated in a yellow field in the switch window and the range is also shown in the arch with yellow:
When the tank pressure drops below 50 bars (so within the red area in the arch) the actual tank pressure value is indicated in a red field in the switch window and a mandatory alarm is triggered: