Try this until you find the source of the trouble.

Put $Post=N at the beginning of your code. All subsequent calculations will be numeric.

Then put $Post=. at the end of the code to return to the default mode.

Actually, I'm a little surprised that AngularGauge doesn't have a fractional scale option.

Talking of decimal points, until a few versions ago GeoScaleBar gave integers as scale tags, as in

GeoGraphics[Entity["Country", "UnitedKingdom"], 
GeoScaleBar -> Placed["Kilometers", {Right, Top}]]

Now the numbers have decimal points, as in 100. km

I suppose the change is not intentional, because the example pictures in the documentation still show integers, until we re-evaluate.

I'm on 13.1. I subscribe to a yearly subscription, but in their infinite wisdom, the folks at Wolfram stopped allowing yearly subscribers to update. I'm stuck on whatever version is available on the day I subscribe unless I pay for the support package. This is annoying because my renewal date is typically just before the major revision. With that off my chest, copying and pasting your code into 13.1 yields fractions for me. I very much appreciate the post!

All the best.