Why? Why image? 20 gauges is 20 values. Gauge shows current state of some measurement. Why the friend needs picture of gauges. You can easily format the email content as current state of your measurements as json which in other end can be feed to local node red and show the state with gauges. But what really means something is state. And may be proof that setup is working well.
Move data, not the representation of that same data.
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