Go to tower hobbies and find thier ESC selection.

Scroll thru it till you fiind the UltraFly 25A ESC and
programing card. Its fairlly cheap and it works
great on my mx400.

AND NO...you don't remove the red wire as suggested
above or it won't work because the ESC supplies the
power for the reciever.

By the way, my son uses that gyro you bought...It
works great.

AB