GrovePi/MQTT/Node-Red dashboard

I am a beginner and I have some sensors grovepi sensors reading data and sending to mqtt. The data is sent as Json (if I am understanding this right)Screenshot 2020-03-28 at 17.01.01

Then I am trying to get for example the brightness data to be displayed in the ui as gauge but I dont know how to do it, my first attempt was to grab a mqtt input node and connect to the gauge

Obviously I am doing something wrong there and this noob here needs some guidance please.

What does the output of the mqtt input node look like ? (set the debug node to complete msg object)

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