Hi Jere, I am not the manual man, but there are some good people here, like Huck. I can tell you that as I see it the problem that you have is mainly the Speedo drive. The one VTD uses an inductive pick-up, so the speed sensor has to go to the TCU to be converted to a digital signal to run to Speedo. Depending of where the speed sensor .is on the European box that you are going to use. If it is on the front diff, you can just change to sensor for an US Hall Effect type that will run the Speedo. If it .is inside the box, it is an Inductive type, that will have to go to the auto TCU to be converted to the ratio and Digital square wave that the Speedo needs.
The only other difference is that the VTD box is longer that the US one, so the rear mount, and tail shaft will be different to the US conversion.
There have been a couple done here in Australia,
http://www.subaru-svx.net/forum/show...ghlight=speedo
but I don't know if the type of box they used, is the same as you will get in Finland.
All the best,
Harvey