your talking about the 3 gauges in the middle? if so then yeah its easy, just cost depends on the gauges you want.. and you can do 52mm (inside the glass) or 60mm (outside the glass).. depends on the look you want.. Also i have seen a pic on here of someone putting 60mm behind the glass too
i changed mine with std 52mm ones.. and easy fitment.. however i am a plastic turner so i just made some spacers on the CNC to fit.. but you can easily fab something up