Buzz Feiten says he can retrofit his tuning system into any guitar. Not sure if that includes acoustic, but I don't see why not.

http://www.buzzfeiten.com

Try this, too:

Equal Temperament Tuning Method

It's a set of instructions showing an interesting way to tune your guitar so that chords sound good all over the neck. Check it out, maybe you don't need to sell/fix your axe after all.

[Edited by iamthe_eggman on 12-31-2003 at 08:28 AM]