6V runs just off the receiver, so three grouped wires. 7.2 runs off the receiver and the separate FET lead into the speedo, either on the + tag or the FET lead coming from the speedo (not all speedos have this)
7.2 will generally give you more torque and speed.
Do NOT open the speedo, just run the FET lead directly off the positive solder post, or send it back to have the blue lead replaced. I always run off the + post though, no matter if i have a separate lead or not.
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