How can you wire to a fuse?

This is a hack, but you can go to radio shack and get fuse taps. These are metal terminals that you attach to the two blades of a fuse.

It's fairly self explanitory, but I would also add an inline fuse for those gauge lights, you don't want to have an electrical fire in your dash.

For a little more money you could get something like this:

http://www.partsexpress.com/pe/showdetl.cfm?&DID=7&Partnumber=071-580

That is a little bit more elegant, but it does the same thing