Well I just duplicated what I used to get the p67a-ud7 b3 motherboard working 64 bit and nvidia card fully functional. Wanted to do this again before posting. Everything worked as expected again.
The main guide I used originally and still use is from:
viewtopic.php?f=79&t=15834&start=20 from Joshnyc with slight changes for this board.
I use this guide on both my gigabyte and asus boards.
The gigabyte p67a-ud7 b3 needs a dsdt.aml for the nvidia card to work and the
IOAHCIBlockStorageInjector.kext to get rid of the orange icons.
Now:
I used the iboot legacy 2.7 , Multibeast 3.4, tonymacx86NVidiaupdate.mkpg all downloaded from the TonyMac Downloads.
The bios has the hpet to 64 bit and ACHI as your other guide has and the cpu multiplier to 32.
boot with ibootlegacy 2.7
Clean install 10.6.0 off retail
do not reboot
Combo update 10.6.7 (not MBP edition)
Do not reboot
BridgeHelper 2.0
do not reboot.
next Multibeast: DO NOT use easytbeast or dsdt install
do select the rest as Gordo74 has in his excellent graohic. I also add iousbfamilyrollback and the tonymac remix theme so I have a graphical interface.
ALSO: under osx86 software add kext utility
under kext and enablers under audio: under realtek, choose alc8xxhda and applehda rollback
under nondsdtHDAenabler choose the alc889
then let multibeast install.
do not reboot . run the tonymacx86Nvidiaupdate.mkpg
You can now reboot.
I always boot verbose. Anyway if you have any reboot problems check the bios as both times I have installed to this board, the multiplier had reset to 34.
Once in macosx after setup I add the IOAHCIBlockStorageInjector.kext attached here.
to the extensions folder in EXTRA and run kext utility which should be in the applications folder installed by multibeast. hit quit when kext utility done.
Add the dsdt.aml attached here to the extra folder. I created the dsdt.aml for this board using evo dsdtse.
Reboot and should be up and working.
Hope this was understandable and no need for graphic injectors or editing com.apple.boot.plist for this board.
Hope this helps.