The 3/4" hose is the vent that runs back up to the top of the fill tube.
Not sure about the two lines on the top of the tank but one should be a supply and the other could be a vent, return or smog
I have 97 Wrangler and am looking to connect an LS-1 to the stock gage cluster.
Does anyone know where I can find a wiring diagram for the gage harness?