A team's thermometer will only display if the team has set a fundraising and/or recruitment goal.  If a goal is not defined its thermometer will not appear.

You can add a goal for a team by
-going to the Event Admin Tools section of your event
-clicking Manage Teams and Team Members
-Highlighting the team to edit and clicking Edit Team

You can now specify a fundraising or recruitment goal.

The team captain can also do this by editing their profile from the Participant HQ.