most efi systems i've seen run 40psi. however not sure as to what 2t-g is. I'd be 90% sure it is though. if your running the std computer give it a shot at 40psi, if you've got aftermarket it's not as critical as u can tune for it, but still i'd run 40. I read an article about 2t-g injectors and all the flow rates were meausured at 40psi as well -- so again pointing towards 40psi. Hope this helps.