Here's what I would do if I just wanted to run a couple wires.
*Remove the seat.
*Remove the two bolts holding down the rear of the tank.
*Pop the trim panels away from the tank in the rear.
*Lift the rear of the tank an inch or two. It might be helpful to release the wiring to the tank from the clip on the left side of the tank mount.
*Gently run a stiff wire from the rear to the front of the tank to grab and pull your more flexible wiring through. It's hot under there, be sure it is adequately insulated.
*Put it back together.
For the record, I rarely remove a tank. For almost any need, the tank can be removed from its mounts and rotated up in the front, then over to rest on its top (think backflip) with adequate padding. As I recall, it's helpful to disconnect the fuel pump and sending unit wiring and pull one or two vacuum hoses...nothing more. If you have some way or someone to support the tank upright, even that is unnecessary. No need to disconnect fuel lines or anything else.