My W9 has both gauges and I was wondering if this comes standard with a full gauge package ? and what's the advantage to having the Amp gauge ? If any ?

Thats a pretty standard setup on the premium dashes. Basically the voltmeter tells the condition of your battery/alternator and the ampmeter tells you how much you are drawing from the system. So if you're are sitting with everything off and the amp meter is on the discharge side something is draining your battery. So you can fix it before you're on the side of the road. The same goes for when its running. Generally it should be centered or just charging a little bit when you have all the lights etc on going down the road.

Thanks for the info.