1. Looks like generic Faze guage you can grab from almost any major parts store (Auto Zone, O'Reillys, etc).
2. The install doesn't look too complicated but I'm sure it took alot of time and a good bit of skill.
3. Fuel guages are a major pain in the butt to replace because a. aftermarket fuel guages are few and far between, I'm not sure if faze makes them... don't quote me on that. b. you have to find one that will work with your specific fuel guage type. So he left the guage stock as to (probably) not have to deal with the B.S. related.

4run95 those guages look awesome. props