Here is how to "easily" install Google Apps (gapps) on our HDX devices (tested on 7", should work on 8.9").
This procedure will keep all amazon app services working, thanks to an Xposed module.
- Root your device
- Install Xposed Framework + my xposed module "HDXPosed"
- Copy thor-gapps-installer-1.zip to sdcard
- Flash thor-gapps-installer-1.zip from safestrap recovery
- thor-gapps-installer-*.zip is just stock jb gapps with "welcomescreen.apk" removed and stock launcher added if needed
- all work is done in HDXPosed module, more information on the HDXPosed thread