Here's what I found when I replaced my tank a couple of year ago (or was it 3!)
First, make sure your sender is the correct one. I bought my tank, Spectra Premium F32A (Canadian made) from RockAuto as it was cheaper than buying it locally believe it or not. I also bought the Spectra sending unit, FG87A, but found there had been a mistake in their numbering and it was the wrong one. I reordered a Dormann 692232 which is a very good replacement unit.
To install, I did have an empty tank, so I bought 19 liters, 5 US gallons, of premium gas. That should have the gauge read 1/4 full. Afterall, it's the bottom 1/4 that's most important! I don't remember now if it was high or low, but regardless, what I did was to use TWO floor jacks to raise the left side of the car (one at the front jack point, one at the rear) AND used jack stands, high enough to be able to remove the sender without spilling gas. Adjust the arm as 71ProjectJunk describes until it read 1/4 full. It's a bit of a pita, but worth doing right.
As for your lines I suggest using fuel injector rubber hose as it is ethanol resistant on the INSIDE and PLEASE< use proper fuel line clamps, either spring type or the ones I show at the pump. NEVER use gear clamps on fuel lines (or anywhere else that really matters).
