Is your vehicles fuel gaugeon the "level"? If you don't think you're getting the right readings or you're building a new fuel cell look at AeroflowPerformance fuel sender units to complete the job. These fuel level sending units are quality units built to send reliable, accurate data to your gauge/dash so you will know exactly where you sit on fuel. They are a universal tube style fuel sender that work in all Aeroflow fuel cells. Or purchase the weld on ring (AF85-1500 sold separately) for custom applications. Available with many different OHMs readings from full to empty to suit a wide range of vehicles (we recommend you verify gauge resistance range before purchase).The fuel sender tube is 10" (254mm) long and 1-7/16" (36mm) outside diameter. The mounting bolt pattern is 5 x 2.125" (measured like wheel bolt pattern).