this took more time than it looks. the large hole in the rib needed to be cut out, i used Tad's aluminum nibblers and then cleaned up the edges with a sanding drum on the drill press. this worked pretty well, just time consuming. the holes for the screws and rivets in the T407 where already pre-drilled so i used those to match drill the rib... then dimpled the rib and then countersunk the T407 ring... THEN riveted nut-plates to the T407 ring. all this makes a smooth surface so it can be sealed with a 'Vans Cork Gasket' and ProSeal.
the other side ... the hole in the middle will hold the Float sending unit.
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