95% success!

got it wired last night, and it runs great, put in a code to use piranha 2, and that was excellent as well. The controller has a max turn of 45 degrees, so if you have a high sensitivity in XL, this would be just right for you.

the 5%

A and B are hitting both functions with a single press of either button.

fix tonight: separate the button A from the board, and have it hit a microswitch. This is not too difficult

left brake: which I set as the II button is not working. There must be a loose connection somewhere so I need to figure out that one thing. If I cannot figure it out, I will just add the Z button and use that as left brake.