I'm a type 1 and on a pump, but I had the DS, so the sleeve plus the intestinal switch.
If you're interested, I'm happy to share my experience with the DS and type 1. The short version: my last A1c was 5.8, and I have been incredibly slack about testing. The year pre-surgery, my best A1c was 7.3.
Immediately post-op, I was taking one-fifth of the insulin I had been prior to surgery. I really don't know whether the same thing would happen after a sleeve. I actually think you might do well to ask the Type 2's on the VSG board what their experience was with the diabetes meds and/or insulin immediately post-op. Did they go off meds right away, or did it happen more gradually as they lost weight? The answers will give you a clue about whether you need to really crank your pump down post-op, or have a much lower rate of IV insulin drip than your previous basal rate.
Good luck. Let me know if I can help further.
Type 1 diabetic, 26 years
With great power (the DS!) comes great responsibility.