Color change on Measure Bar

[subas]

Dear Admin.

I understand the level part in Node-Red. 
But where do you key in the criteria if I want to change the color based on specific criteria?

28 deg to 35 deg color shown on the level is Green
36 deg to 40 deg color shown on the level is Yellow
41 deg and above color shown on the level is Red

Please advise as the screenshot you have provided does not show where to insert the above criteria?

Regards
Subas