I was nervous about tuning, open loop is about as easy as it gets. There is a great write up Russ k on hpt forums for open loop maf tuning. It takes half a day if that to get dialed in. Once your done you plug the narrowband back in and your good to go, you can fine tune your fuel trims after if you want but if you did the open loop right, kinda hard not to, they should be pretty close already.