I agree with what Iain says, BUT this looks like it gives the ability to tweak as conditions require - if you know what you are doing.
  Add this to the barometer/humidity/temperature gauges that tell you what the weather is like and what changes are needed and a carb setup will be as good as injection................ 
 Tell you what, if you order them I'll try them on the flatslides and if they work I'll buy my own
