Putting on a LH gas tank

[BrookelynnGreen]

My truck must have been equiped for a dual gas tank setup. Right next to the ash tray is the switch for LH or RH tanks, the bed panels have opening for LH & RH tanks, currently use the RH tank, but when I bought the truck it didn't have a LH tank. So I went to the salvage and bought a LH tank. What I'm wondering is if I hook up the three hoses to my three hole sending unit, and bolt on the LH tank, do I have to take my truck bed off to install the tank properly??? AND also, right by my driver side headlight is a black cylinder thing that I think is suppose to be connected to my gas tanks. It currently has 1 maybe 2 hoses hooked up to it, and I believe it has 4 outlets. Do I need to hook all the outlets up? Can someone explain to me exactly how I'm suppose to do it bevause I really want my LH tank to work... Thanks in advance!
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