[dvldoc]

I don't know why you would need a return line there is nothing to return, I would cap that off, You have to drill a hole for the level sensor it has it's own sealing fitting. Just check to see if the AN fittings have a 1/4npt thread or a 3/8npt thread if you do get that then you'll know what to get, I can't tell from a pic what size there are.