From what I hear, it's just a matter of taking off the trim ring (just pops off) and removing the vent louver assembly. Realistically, it's a good idea to "tape off" the duct near the HVAC area in the center of the dash to keep hot or frigid air from blasting the back of the gauge, once installed. After that, it's just a matter of fitting the trim ring back on around the gague. . . . . . I THINK.