Retrofit Head Up Display

[IAN-jmcwi]

I was hoping some pistonheads might have first hand experience of retrofitting their car with head up display. My circumstance is that I have an import Forester STI with KMh only speedo. Unfortunately I can't get a fascia for the dial so having to look at alternatives. It is also needed in Northern Ireland for MOT to read in both mph & km unlike rest of UK ☹

Looking any recommendations please as there doesn't seem much on a Google search for real world reviews.