You may have noticed your Google Sheets data is brought into Visible as a number with no unit. To change the unit, you will need to start in the "Metrics" section. Next click the Google Sheet connection you would like to edit. From here, a list of the connected metrics will appear:
Select the metrics you would like to edit (or click an individual metric). Click the "Edit Settings" button and the following will display.
Click "Save", and you're good to go!