How are you setting the chart data? From the playground sample I would
assume that rather than c+p the code for the chart (creating a new
instance of the gauge) What you want can be achieved by adding an
extra column and one more piece of data to each of the rows. This may
not be exact as I am doing it from memory. When setting the data for
your chart:

Display 3 charts
addColumn(['Gauge1','Gauge2','Gauge3']),
addRow(['32.5','45.3','32.4']),
addRow(['32.5','45.3','32.4']),
addRow(['32.5','45.3','32.4'])

Display 4 charts
addColumn(['Gauge1','Gauge2','Gauge3','Gauge4']),
addRow(['32.5','45.3','32.4','32.1']),
addRow(['32.5','45.3','32.4','32.1']),
addRow(['32.5','45.3','32.4','32.1'])

These methods should be changed depending on how you are declaring
your data, for instance if you are declaring it from an array then
each array row should have one extra item in it.
E.g.
3 charts
array[0]=['Gauge1','Gauge2','Gauge3']

4 charts
array[0]=['Gauge1','Gauge2','Gauge3','Gauge4']

Make sure that all your rows have the same number of items in or you
will most likely get a not a valid 2d array error.

Hope this helps!

Dan

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