TMobile G2X as dev phone

I'm trying to use my T Mobile locked LG G2X as a dev phone while I wait for my GNex4. I can't get the phone to be found by ADB. I installed the p999 driver from LG's website. This didn't help anything. I tried adding the VID manually to adb_usb.ini. The VID I found in device manager was USB\VID_17EF&PID_4807&REV_3134 so I entered the line 0x17EF into the file. This didn't help either. How can I get the p999 working as a dev phone? Does anyone know the right VID entry for the p999? Also, when I plug the phone into my Windows 7 computer, the phone charges, but does not prompt any sort of device discovery message from windows... does this indicate some other problem? My USB ports definitely work.