You either have to use something like that sender or create a second line fitting into the tank. I don't recommend this for faint of heart, but I used an awl to punch a hole into my tank, flooded the tank with a CO2 bottle off my MIG welder, and then brazed a piece of tube into the hole
On the wix filters, there are several part numbers, for 5/16 or for 3/8 on the main tube, or for inline or 90 exit for the return. Be sure to run the return "at the top" of the can or follow directions for positioning. On the "inline" return, either mount the filter horizontally with the 1/4" return at the top, or mount it vertically with the 1/4" exit pointing up