Linking wahoo blue sc to the watch as a wheelchair user. Wrong speed and distance recorded.

I am not too familiar with the Wahoo sensor, but have you checked what you have the wheel size set to? Go to the list of sensors on the watch and select it and you should see "wheel size". Calculate your wheel size (which takes into account your tire width) using an online bike wheel size calculator. I hope this helps!

So i have a special size to put on wahoo. And this provide accurate however i can't see the same for the watch.  I m disappointed with it as it was supposed to be great for wheelchair user but everything is done half way. I don't even know how to the workout as they dont appear on the app either. 

hmm, usually wheel size in circumference is in mm and usually 4 digits. Take a look at this FAQ: Setting the Bike Wheel Size on a Garmin Fitness Device and see the drop down for wheel size. It should be in the 1900-2000's range but I am unsure of your wheel size. You will want to make sure it is set this way on the watch itself.