My current set-up is 1/4" lines coming from my wing tanks to the my header.  Then a 3/8" line feeds my engine.  In this configuration I can only feed the engine from Header only. This is the stock Lancair 320 fuel system.

I would like to be able to run my engine off my wing tanks if needed but I don't want to re-plumb the wings with 3/8" lines.  Can I connect the 1/4" wing tank lines into a "T" with a 3/8" exit and run the line to the selector valve?  Essentially the wings would not be able to be selected but they would feed at the same time equally. 

Would this idea work?  And if so what type of Andair valve would I need?  One with just a Left/Right/OFF  And I would have them custom engrave the bezel to read Wings/Header/OFF

Thanks

Bryan