/Does the undertail only have the two bulbs for the taillights, or does it have the two little turn signals also. if it ONLY has the tailight then yes you need the integrator.
are you asking what wires are what on your bike, or on the undertails light. I have no Idea on it, but you can usally figure it out. the ones going to the side of the bulb socket are ground.
On the bike, I'd need to pull up the manual.