The 2d, 2s, 1s systems etc have been discontinued as of the 1st of the year. The current Aquamist lineup going forward is the HFS-2,3 and 6. There maybe some of the other systems is stock at the retail level, including the soon discontinued HFS-1. The 2d,2s, etc will still be supported but most parts will be harder to source or go to the factory for repairs etc.

All that said, the connection to the fuel injector for the IDC signal should not affect your ECU or fuel system. Depending upon what mix of fluid you plan to spray, you might be fine with a single jet, or may need to use two smaller with the new HFS systems. If you do plan on using the 2d, we need to look at the injection rate and pump capacity to make sure it is enough.