AN fittings would be best, and Fragola makes compression-style adapters that could go on that sending unit after you cut the hose barb off. That adapter makes a "cut off steel tube" basically have a male AN fitting. Then, just go ahead and use the corresponding female AN fitting on the end of the hose. I'm in the process of basically doing the exact same thing with my wagon. You could also just use fuel injection-style hose clamps, but IMO, putting them over steel braided fuel line probably won't work that great, especially with the higher pressures of efi.
Here you go..http://fragolaperformancesystems.com/ha ... -fittings/