- Lower trim provides a 7mm screw and T20 screw. Clear away and pull down challenging. Not required to remove lessen trim for 2018's. Speedometer conveniently calibrates to OEM or aftermarket car or truck speed sensors plus the tachometer is capable of calibrating to numerous engine styles Cost Match Ensure: https://hectorhxnbp.bloggazza.com/31121594/about-2018-ford-mustang-digital-dash