I just got my first powerball, but now I regret that I didn't get one with the speed meter.
I found on the shop that you can buy one (for a reasonable amount of $$ ).
Now the trick is that I happened to buy a non-relabeled NSD Powerball which I understand is the same as the RPM powerball...
Can I still get a speed meter from RPM and "install" it by myself?
The place I bought the powerball from doesn't sell just the speed meter.