Easily switch to the power level you need in your SCT tuned 2015-2019 Ford 6.7L Powerstroke with the GDP Tuning GDP210022 SCT Shift-On-The-Fly Switch. By a simple turn of the dial left or right, you're able to command your truck to give you more or less power! FEATURES: Rotary Switch Easily Change Tunes Quick Installation Note: Switch only. Tuning is not included. Your truck must already be equipped with SCT shift-on-the-fly (SOTF) tuning for this switch to function.