Hi guy,
99er here. My stinking job keeps me far away from the PC nowadays so sorry for the delay in responding. Write me!
I never had a chance to look into the housing on the 2001+ Bandits. They can't be all that different from a basic operations perspective. I would expect that Suzuki modified the switch and electronics but kept the engine the same. Why make any significant change to a proven, dated engine when you can modify a cheap switch? If that holds true, you're in luck.
The older switch simply acts as a grounding point for a neutral bulb. Now that you've bought the better switch, install it and then place an ohmeter on each pin for each gear. It should go to "0" ohms when you select the proper gear. You can use a test light as well. Make absolutely sure that the rear wheel is elevated and turned in the forward direction to its stop after each gear shift to set the trans shaft or you'll become very frustrated wen the switch doesn't set - been there.
After this, and you may just be fine, you'll need to determine the purpose for the modified switch in the later models to make sure the bike will run normally. Do you have a schematic?.
I'm curious to see how it pans out. Let me know.
Now, if you're near Atlanta, stop by and we'll mod that B12 together!
Marc/Atlanta GA