My babies are 5 and 9 now, but I *still* have to bring my guitars to work if I want to do any maintenance (during lunch break of course)!
I'm sorry to say that it *looks* like the switch is wrong from the photo in your post.
If it really is from a 2001 RG570 then that's the problem!
The 570 has 3 pickups and uses a fairly ordinary switch. If this goes wrong it can be replaced with something easily available from say allparts.
The 2 pickup RGs use a different switch custom made by Ibanez to get the series and parallel options.
The confusion comes because I think both switches look the same as only the PCB is different, the case is the same!
You could replace the switch with the right one a SC/2502W from Ibanez, (Cottam guitars in the UK stocks them) http://www.cottamguitars.co.uk/index...mart&Itemid=26
They look like this:
Failing that you could use one of the 4 pole megaswitches if they're easily available in the Antipodes ( I can give you the circuit)!
Finally you could probably get something like the normal options using your switch and a push pull pot, I'll think of a circuit for you if you want.
(oh, and it doesn't matter if the wire goes to the switch casing or the pot casing provided both are earthed)