Switching to LT285/70r7

Switching to some big boy tires on my 2011 TRD Sport V6 automatic with stock gears. Running 265/65r17 and switching to 285/70r16. I realize that the speedometer and mileage reader will be off. What’s the best way to fix this and get the computer to read accuaratly? I’ve heard of re gearing or taking the truck to get the computer reset. Can’t find a direct answer on the forums. Just wondering what will Be the best route and what will Be the easiest. Thanks everyone for the information. Or just tough out? Haven’t seen or heard of many people changing anything. Just putting lifts and tires on and then I never hear about them changing the speedo and all that. I guess it’s just my OCD kicking in and my curiosity haha. Thanks for the help everyone.

 

I'm on 295/70/17 and my speedo is dead on with my GPS. I wouldn't worry about it.