Return line fittings are trickling in now. We’re using #Russell 644123 fittings on the flex sensor. The inlet will fasten to the #Fuelab afpr using #Vibrant 16860 -6 female AN to 6AN orb/o-ring fitting. The outlet will use the same Russell fitting along with a -6AN to to 6mm barb fitting connected with a -6AN union fitting. Not the simplest or cheapest way to go, but should look clean, mount to the afpr securely, and hopefully seal well.