If you want it to look rat-bikeish get a narrow piece of copper tubing, (FLAPS) and a couple fittings. Put a nice coil in it right before it enters the side of the tank, well one fitting anyway. I was thinking clean before, but if you want to do that then the coiled copper would look perfect. Get enough line to run it up to the widest part of the tank and put the fitting in the side, keep it all tight to the bike so it doesn't get hung up on anything.