Hey guys my odometer has gone dark and I don't want to have to test every fuse. Does anyone know what fuse is the one that will have gone?

 

Just the odometer display and none of the other instruments or instrument panel lights? If that's what has happened, I doubt it's a blown fuse, but rather a problem with the odometer display unit itself. The fuse would cover more than just that little bit.

Your car is under warranty; I'd take it into a dealer and let them deal with it if you can't trivially find and fix the issue.