MAKE FULL BACKUP of STOCK ROM FIRST!!!
make a back up of your user apps using titanium pro(optional). take the aospcwmodrecovery.img and place it on the root of your sdcard, be sure there is the flash_image file the root of your sdcard also..then using terminal emulator punch in
su
flash_image recovery /sdcard/(revovery.img name)
after done flashing boot into recovery to be sure it flashed correctly..now go ahead and put the debug.zip from zephies cm7 thread on the root of your sdcard then put gapps.zip and aospcmod427.zip on your sdcard
then boot into recovery, install the debug.zip, then wipe data/factory resest, go to advanced and wiped dalvik cache, then wipe battery stats if u want...then install aospcmod.zip, then install the gapps. reboot. your done