Right now the harness is completely out of the car. The original 85 harness crumbled as I removed it. A perfect candidate for the swap. I got a harness from a 96 droptop at the U-pull it yesterday ,the ECU, a DI cassete, injectors and all the sensors for under 50 bucks. I started out my day thinking I was gathering parts for another project. As the day wore on it made sense to just T5 Every 16v turbo project from here out. Can't beat what you get for the money.
For sure, if you are already that far and got it for that cheap, why not. It's not that your car will run bad, it'll very likely run better than before. However, for real tuning purposes, T5 has its limitations. You'll need to change maps as the car it came from has different manifolds and thus different air flows. Plus you want to make it run to your liking. There is some good information about changing maps and other T5 stuff on ecuproject.com.
I wanted to implement T5 in my 900t as well. I did lots of research for a while but then got a bit stuck on seeing how all of the different maps in T5 influence themselves and how the adaption comes in as well. Then my Masters thesis had to be written and I had to place everything on the shelve. What I noticed when I was researching is that there are not very many people around who can tell you how everything works in the big picture. For example, if you go to a Eddy current dyno and run the car at steady state how does a change of the fuel and ignition maps changes other maps in T5 and then how does the adaption influence all of this in the long run? I know that they say adaption is only on in closed loop, but if you map closed loop to rich the long term trim in T5 trims the fuel down and at some point you'll run too lean at WOT. This being said, however, I recently learned that you can turn the adaption off which probably helps in the example given above. On the other hand, I also learned that T5 reacts rather slow to changes.
I recently drove in a car that had T5 in it and it was OK. I didn't think it was really fast nor that it run much smoother than my LH 2.4. What I liked was the steadier boost though. Compared to Dennis's 900t with the coil on plug setup and proper tuning, however, it didn't stand a chance. Dennis's car runs phenomenally good thanks to lots of research and proper tuning that was done. I still have to come along a 900 that runs better.
Either way, as said above you already have your stuff so you might as well put it in. Also, there are lots of good people on this forum and this might help to get things sorted out. When you put the DI casette in your car SwedeSport, you have to paint it silver though