Negative knob, zero-based starting point

Apps & Services HABPanel
1

Hi folks,

I have a knob which goes from -1000 to +6000 and is showing my grid power usage. When the sun is shining and I am feeding back into the grid I go negative.

I want the bar of the knob to start at zero and not at -1000. Does anyone know of a similar knob or how to make this one behave like this?

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A similar question was asked here: Knob widget set center point?

thanks
C