You have the 2-pedal system, where each pedal has its own toe movement, but neither slides forward/backward?
If you want to hand-wire I can help you out, but it might help if you have a little more supplies than I did. I used some copper wire that was the exact perfect size to fit into the gameport holes, but I wish I'd had a proper radio-shack gameport adapter (where you wire what you want to the proper pins).
Basically all you have to do is get the power in to the pot, and take the signal coming out to the 4th axis. Then you just hot-wire the power in to axis 1, 2, and 3, (with no pot in between, they're just fully deflected all the time). This fools the system into thinking you have a 4-axis stick, and it recognizes instantly in windows. Then you just calibrate it by ignoring all axes except the rudder. You move that to both extremes, then finish. In AH you just clear the assignment of your stick's twisty motion, then apply on your pedals the rudder axis only on the 4th axis.
Learning how to use them properly, that's the real challenge.
If you're thinking of going this route (hard-wiring) send me an e-mail I can help you out with what you need to do.