If you want an EFI for your Sprite, I would think the unit off the 1.3 Mini would be just the trick. They come as 1 and 2 injector units, depending upon the year. Should bolt up with little effort. I'll bet the biggest problem is changing to crank sensor timing. But, IF you really want EFI, this has to be the most straight forward approach. I know the "wizzards" have tried to tune these units without success, however they provide good HP and fuel economy as is.