This is my current garage door setup. a GE Security 2315A-L Overhead/Panel Door Track Mount Contact w/Armored Cable, Closed Loop Normally Open. I used a GE wireless contact with a built in N/C terminal and disabled the reed switch. If you are prewiring then you wont need to do the same I did.I bought it from Homecontrols.comhttp://www.homecontrols.com/GE-Security-OverheadPanel-Door-Track-Mount-Contact-GE2315AL
I would like to send you pics of my setup but I can upload 100k filesIf you send me a private message with your email I would e-mail you directly