Fuel level sending units

ttt I am in the market for one now and don't want a new POS that don't work. I see one out there for sale for $110-120 range . Are they any better then the $40-60 ones?
http://www.ebay.com/itm/310975355167?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2649


I don't see where you would hook the gas gauge wire to it...