Help with Gauge Code

I am making a Gieger counter style gauge for a face and want to make the gauge show either heart rate or just randomly bouncing like a Gieger counter. I’m not sure of the code to do for this. I am using a simple fuel gauge as the template, so I want the “second hand” needle to either allow the show of heart rate or randomly popping around.

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Random is a bit weird in facer . What I do is have a couple of timers running and subtract or add them . You could have the heart beat providing the Pulse timing and the " Random " providing the Amplitude . I will show you some heart stuff . I will try make a quick test with your Gauge .
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This is as far as I have got . It will change as it is a WIP.
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Thats perfect. Thank you so much, I have alot to learn about the coding.

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Cool . I have not managed to do what I said with the amplitude . The sin rad combination gives a number -1 to +1 . You will see it a lkt as you go along . Yuo just have to learn what it does . How it dose it is another matter .