Yeah, 3 screws, its for the lift pump in the fuel tank. There should be 3 wires going to it IIRC, the fuel pump ground, 12v and gauge resistance wire.
You can route them elsewhere pretty easily if you want to, along the floorpan outside then up underneath the fuel tank, easy peasy.
You'll need to armour the cable and make sure its water tight, check this place out
http://www.vehicle-wiring-products.eu/ for good quality wiring bits.