can some nice person out there confirm which way up the ZX12 fuel sender goes, saving me from connecting everything up or drilling too many holes in my fuel tank.

I think this is the empty position

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And this the the full position

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Cheers in advance

Yep, you've got it Chris. Arm might need to be shortened depending on depth of tank.

cheers Mr Hellfire, was just making sure

It is also best twisted - take off the circlip and manhandle it you'll find the mount is slightly off horizontal/vertical if you're using a standard MK tank - as shown on Mr Hellfires' webshite...