servontaut a replacment for tamiya mfu?

[Grip_Runner]

Brel I have been looking at the servonaut unit and it looks fairly easy to wire up if my presumption is correct. if I understand it right you have to positive terminals to connect to and the negative feed is plumbed into the appropriate terminal i.e. one wire from one of the common positive's to the led and the negative from the led to the brake light terminal for example or have I got it wrong?