Annoying behavior of a dynamic angular gauge

Don't know why but if you have a Quantity[513.2441798845927, "Minutes"] wrapped with Dynamic, then AngularGauge can't handle it and shows two inputs, 513.23 and "Minutes" (blue one).

I also don't know if that's suppose to happen but here's a work around:

Use QuantityMagnitude:

Dynamic[AngularGauge[
   Dynamic[Refresh[
     QuantityMagnitude @ DateDifference[Now, Tomorrow, "Minute"], 
     UpdateInterval -> 0.1
   ]], 
 {0, 1000}]
]

Or don't use the inner Dynamic since there is one outside anyway:

Dynamic[AngularGauge[
  Refresh[DateDifference[Now, Tomorrow, "Minute"], 
   UpdateInterval -> 0.1], {0, 1000}]]

The former method gives you more flexibility I think.

It can also be done this way. I recommend it because it avoids passing any complicated dynamic expression to AngularGauge.

Dynamic[
  AngularGauge[
    Quantity[DateDifference[Now, Tomorrow, "Minute"]], 
    {Quantity[0, "Minute"], Quantity[800, "Minute"]}, 
    GaugeLabels -> "Unit"], 
  UpdateInterval -> 1]

The tooltip confirms that the gauge is dynamically updating.