Male NPT (National pipe taper) to Male AN adapter.
Choose your thread and material. Aluminum fittings are black anodized. Steel fittings are zinc plated. Stainless fittings are natural finish.
1/4 NPT is common for Tanks Inc and Holley fuel pump sending units. (Only 6AN fits that application).
Use Gasoila yellow thread tape; a good Teflon sealer; or blue loctite to seal NPT threads.
NO sealer is required on the AN end! Only a tiny dab of anti-seize on the threads if you want.