[usbcd36]

There are ways to do this with sensors, however, the motors will not "automatically" turn at the same speed.

If your programmer really knows what he's doing, he'll be able to do this, given some time (PID for position control, PD for velocity control, etc…). If he doesn't, he can probably find the information here.

Also, if you haven't corrected the problem with the gear tooth sensors (which involves switching two tiny resistors on one of the boards), you won't get anywhere with them.