Here a fix to make it tekkit compatible, whether old Greg likes it or not.
1) Download the gregtech addon from here
2) Open the zip, go into the gregtechmod folder and replace the GT_Mod class file with this
3) Install it to your tekkitlite manually or using the customzip feature, resolve the block ID conflicts with mystcraft, tubestuff and transformers
4) Enjoy the lack of enjoyment that gregtech brings to the experience
Congratulations you're now playing minecraft on your own terms