I just found this thread tonight, thanks for posting it Billy. I've read most of it and will follow up.
I am planning on using this system on a 26 cc two stroke which currently has a WT668 Walbro carb, by replacing it with an electronic regulated diaphragm carb.

I too have compilation errors with the code. I always do have when starting a new arduino project for various reasons, mostly my inexperience.
I've managed to install some of the missing files; that process takes time to learn, but become easier after you have done it a couple of times.
When you encounter a "No such file or directory", do a search for that including the title GitHub. That should direct you to the page with the file.
The GitHub page can be confusing to navigate, but stick with it, the file will there somewhere.
You can choose the .zip file and download that. Then go back to your Arduino IDE. Under "sketch" you will find "Include Library", click and open.
Then type in the file name in the field shown. Then you will see a big "Install File" or something similar. click that to install it in the IDE.
Or: alternatively, click on "Add File" and you can install it straight from the .zip file in the Downloads or whatever directory you downloaded it to.
To other readers: If I have explained this incorrectly, please correct me and post back!
I don't use Arduino often enough to remember such basics very well. I am a bit of an Arduino novice at best and do not understand code.
Thanks for posting and keep reporting your results.
If and when Raleighcopter posts again, he will likely sort us both out! fairly quickly and efficiently...........Talking

By the way, I have posted over on the other thread on this subject.

Jim.