Pulled Cluster Wont Start.

I would also have to think you forgot to tighten the large black and/or red wires on the back of the amp meter.
What you are describing is exactly what a loose battery terminal does when the starter is activated. (doesn't mean it's at the battery though)
What you have is something loose, so it gets a connection until a load is put on it. Then it burns away the small area of slight contact, and all your power goes off.

Be positive about a good engine ground also, as they can do exactly the same thing.

The "wiggle test" should help you here.
While everything is dead, wiggle the harness wires around the fuse block and amp meter and see if everything comes back on, and when/where.

That's my interpretation of your description anyway. :-) (which was pretty good by the way)