Are you sure?
WhyyyyyyyYY???! Why SDS? Megasquirt is 10x better. I promise. Yes, I have lots of experience with both. I have tuned several cars on our dyno with SDS and its very difficult for many different reasons. 1 of which is that the tuning console takes forever to get to any menu and you can only see a couple of variables at once. Makes it very hard to tune. Then, there is the actual tuning process.
You can only tune by changing the pots for either an RPM or a Load value. When you change a number, it changes all the way across the RPM band if you change a load cell or all the way across the load range if you change an RPM number.
So, say you enrich the 3000 RPM fuel number. It adds that amount of fuel arbitrarily from zero throttle (high vacuum) to full throttle (atmospheric for N/A or full boost for a turbo engine). Whereas, with MS (or any other standalone I've used) you could in this scenario change the fuel numbers at 3000RPM all the way from no load to full load independently. (with a 12x12 table on MS)
If this doesn't make enough sense, feel free to pm or AIM me. I have experience with almost all standalones, as it's part of what I do for a living.
Anyways, I don't mean to be a buzzkill, I just want to try to steer people in the direction that will fulfill their needs.