There ya go.

W/Bk and W/R are the 12V supply to the servo. If these are connected the wrong way then it'll just mean that the servo will operate in reverse as the direction of the current is switched back and forth depending on which way the servo is supposed to rotate to make the feedback from the potentiometer match the parameters set by the CDI/RC valve controller.

lt/Gn is the wiper wire from the potentiometer. Pretty straightforward this one.

The remaining W and Gn/Bu wires are the 5V signal for the potentiometer. Easy to just stick a voltmeter across these to identify the +ve side so that you get it the right way round. The voltage measured will probably actually be less than 5V but hey ho......

What could possibly go wrong?

Matt.