This is the recommended sending unit when running our aluminum tank. This sending unit is fully adjustable and will work with any custom fuel tank. For use with stock gauges or any 0-30 OHM & 0-90 OHM gauge. BED FILL (FLUSH) Polished stainless steel gas cap manufactured from 316 stainless steel and polished to a bright mirror finish. 3" diameter by .08" thick. Available only for bed fill applications. Note: To be used only with an aftermarket fuel tank, not a stock fuel tank. Includes: • Sending Unit for Gas Gauge, 0-90 OR 0-30 OHM's • Seal • Stainless Fuel Cap with aluminum filler • Stainless interface key • Rubber Hose • (x2) Stainless Hose clamps