It's only 12V, so just about anything will do- even a bent up paper-clip.

I don't think you need a fuse for a simple test scenario.
If you notice the jumper getting hot, that's the time to pull it!

If this is a permanent fix, look to see if the power source they've recommended is already fused. If not, then, by all means, put a fuse in the loop.

$0.02 administered!
Good luck!