To edit a gauge, find the gauge/parameter you would like to change and double-tap.
Item: Here you will find a list of parameters that are preloaded on your device. You can find the Analog Inputs at the bottom of this list.
Unit: Based on the item you have chosen from the list, the unit will change to the corresponding unit of measure. If you are choosing an Analog Input, you will need to select the appropriate preset equation based on your analog source.