Forget about the speedo, I think you should use a GPS and hook up an external aerial to use it.. there are several options available.. if you have an iphone you already have what you need.. use this app
http://www.i-hud.com/
Also.. Do you think a tranny swapped in from a 2.2l engine will be able to stand up to an eg33 ? seems like the svx engine will eat that transmission for breakfast...
edit.. better link
http://appulo.us/appdb/?page=viewapp&id=4423
or this one
http://appulo.us/appdb/?page=viewapp&id=3222