No way that I know of to reattach the threads, permanently.

Have you checked a parts screen to see if Kaw sells the lower case separately?

Purchase a used gauge assembly with an unbroken lower case and trade out your internal parts.

 

I may have to go that route but was hoping to avoid spending $100.

I was thinking maybe trying to weld the threads back to the stud but I'm sure that won't work out that great.
My other thought was using JB Weld or something along those lines.

 

If it were mine I would file the end where the threaded stud broke off flat and centre punch it and drill and tap it then make a threaded stud to go in the newly threaded hole.

 

If it were mine I would file the end where the threaded stud broke off flat and centre punch it and drill and tap it then make a threaded stud to go in the newly threaded hole.

i was going to say suggest something similar. I was going to say drill and tap the existing shank. Build and thread in another threaded rod into the existing shank. If the existing shank is stainless it may be super difficult to accomplish without access to a lathe or other shop tools

 

I doubt it would be stainless. Soft steel with a cadmium plating.
If you clamp it in a small vice horizontally it will be secure to drill and tap.
Something like this.

 

The threads are 5mm x 0.8 just to be consistent.

 

Thanks for all the ideas guys. I was also thinking of drilling and tapping was probably the most sensible idea.

I'll report back when I get it done.