- Decrease trim features a 7mm screw and T20 screw. Eliminate and pull down tough. Not necessary to take out decreased trim for 2018's. 13razorbackfan claimed: Also, I just did it a moment in the past, try clicking the gear icon or the Mustang icon then check out trip then https://johnathanxvnhw.fireblogz.com/63310182/the-ultimate-guide-to-2018-mustang-gt-digital-dash