Hi, Henk 

Firstly, I would like to sincerely apologize for the delayed response as we have been experiencing an unusually high number of tickets. I am sorry that it has taken longer than usual to respond to your concern and your patience is highly appreciated.

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As our Documentation on Google Gauges with our wpDataCharts states,

• Only one string or date column is supported (will be used to name the gauges)
• Other columns should have numerical values.
• 2 columns are strictly required.

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So, for this use-case, if you wish to show Min, Max and Current Temp , i would suggest to create three separate Gauges, next to each other, or close to each other, at least;

and you can use one for MinTemp, other for MaxTemp, and third Gauge for CurrentTemp.

We have a similar example on the Docs page with three Gauges next to each other :

Here we took one String Column "Memory" for the first one;

Then the second Gauge, we picked column "CPU",  and for the third one we pick column "Network".

Each of them has the additional Numeric column, to show the values.

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Let me know if that can work for your use-case.

Thank you