Outer Limits 4x4 Board

I have two fuel tanks to go into my GQ so i can have mega capacity for desert & nthn australia missions. It currently only has one tank fitted and i want to get the second one in there soon.
I am trying get a dual filler neck and a mechanism to switch pickup & fuel level info between tanks. the only dual filler neck to suit a GQ i have found is from long Ranger, and is not particularly cheap. their mechanism to switch between tanks is not cheap either. The GU system doesn't fit a GQ.
Has anyone found a good, cheap way to put a dual filler neck onto a GQ. maybe one from a late model landcruiser? are they the same diameter near the body?
Has anyone used the switching mechanism from a 80/100 series or prado and had any sucess?
I am not keen to pump from sub tank to main tank, like the GU system, for a few reasons.

i would be interested to hear what others have done.
TIA

hate to say it (just kidding)

BROWN DAVIS , fabricate twin filler necks
also cen supply 6 port valve & wiring diagrams !!
there in Melbourne , but send shite all over Oz !!!!

Thanks for that moose.
I suppose i should add that i wanted to hear of cheaper, but not bodgy, alternatives than what the aftermarket tank makers sell. i will ring Brown for their prices though.

you could try some wreckers , they might have some ??????

Switches - if you look hard enough - look for an import GQ sub tank switch.

I had one on my GQ until i sold the tank ages ago. - also had that dual filler - BUT it was for petrol - but nontheless i just bored the fillers out with my dremel to accept a diesel pump filler @ the fuel station.

TOM