I have a 4-way 60A. It also doubles (triples?) as a rotary encoder and push button. I have a circuit for converting the 0V,2.5V,5V signal into two 0V,5V signals that you can use. Check out Codename: LlamaBox to see it installed. Don't worry, your circuit will not be as complex as mine.
If I only had the time to make a website to document all this stuff...
EDIT: Apparently Grayhill now has a 60A with 4 positions and 4 discrete connectors. This will make your job even easier since each position will have its own contact. As opposed to one contact per axis.