My buddy uses electric impact wrench. He swears it does just as good as air and you just plug it in and go.

He also has some torque extensions when putting stuff on then uses a torque wrench to make sure everything is right.

I dont know what brand he uses, but we used it on my truck. Something like on this page. But get a real one, not an impact drive, an impact wrench. https://www.sears.com/search=electric%20impact%20wrench