We just upgraded our oem tank on our 2016 f350 last week. Indeed, our truck/computer/gauges were recalibrated to correctly reflect the bigger tank. Do t know the length of time it took to do this as it was part of the instal. BUT! When we upgraded our 2013, we personally took it to the dealer to have it done and it took less than a half an hour all told. Biggest problem was finding someone who knew how!!