Hi guys,
I ran into the same problem yesterday trying to install the Insteon garage kit with my Genie GDO. It's an older Genie model and I can't even find any specs for it online.
It has 4 pins/screws 1,2 is for the wall controller and 3,4 are for the safety light beams.
Anyway I realized that the wall controller only has 2 wires going to it and there are 2 lit buttons (door and light).
Wall Console - Series II Model: GWC-2 Part #: 35661R
http://www.geniecompany.com/images/products/accessories/wall-console_GWC-2WBL.jpg
I would assume it's a multi-function remote and not a dry contact switch.
So could I get that module that Gouldc refered to: (Genie 38013R Dry Contact Adapter) http://www.aaaremotes.com/genie-38013r-contact-adaptor.html#.VznNd4SDGkp
Run an additional set of wires from pins 1/2 to this module and then to the IOLinc.
Would this set up work and allow me to have both the existing wall controller and IOLinc?