Pololu Micro Maestro 6-Channel USB Servo Controller
$19.95
This is Pololu Micro Maestro 6-Channel USB Servo Controller that we recommend for our chassis dyno. This is used if you plan on using computer control for the dyno. (It is not used if you are using mechanical switches).
This servo controller allows the computer to control the throttle of the speed controller exactly the same way every time.