It is a custom gauge based on Canvas. There have been a few recent topics about these such gauges and their various libraries.
You may have to install the canvas library in your node-red static folder... similar to how I did in this post
Here is two examples of the same "gauge" with changes to size, colours, tick marks etc. The script source path assumes node-red's settings.js path is at /home/pi/node-red-static/ and the folder containing the library is called Canvas-Gauges but you can make it however you want and edit the path accordingly.
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