There are high pressure EFI pumps that can be mounted external to a tank. That's one of the lesser worries.
I assume it would take the EFI portion of the wiring harness and associated ECU from a 990. What about the fit? Are the intakes the same size? I know the 990 uses different air filters.
I have both right now ('09 SE and '11 990R) and I could try some fitting, but I was hoping somebody else had done it already and could enlighten me. I like the EFI on the 990 and would prefer to have EFI on the 950.