I was able to use the cruise commander M. Its a direct replacement for the motor driver board. Its a real easy swap out. And like Marty said, it monitors the EMF for speed control. It runs real sweet with cruise control.
The board was 89.95. You have to get the following kit:
Cruise Commander M Kit for MB-036 / 089
- Steamer kit for wireless tether
You will also have to upgrade your r2lc to version 8. I believe that engine came with revision 7.