Huge thanks to Mars for the templates.
Upon perusing the shelves at the local parts store, I found this gauge. It is a Sunpro CP7985 and has a smaller needle than the other one listed here. It looks way more factory. For giggles, I tried it directly in the place of the ammeter. If you don't care about the little blue curve on at the base of the grid, it will pretty much fit right in place without any modification!! Of course, you need to pry it out of the original case that it comes with and make a backing plate for it (to mount it to the EB cluster), but it was an easy swap. Hope this helps someone else out.