- Decreased trim includes a 7mm screw and T20 screw. Remove and pull down tough. Not needed to eliminate lessen trim for 2018's. -Take away the trim to the best of your steering column. Just pull out. This has the small slits in it for that HVAC inside temp sensor. https://one-up-mushroom-bars-for03577.azzablog.com/32050553/the-ultimate-guide-to-2018-mustang-gt-digital-dash