Compatibility issues.

So here's my problem: I have a 48 volt Kelly brushless motor controller and the 0-5k Magura motorcycle style throttle. Now I'm sure you all know this part but I'm gonna put it in here anyways for clarification; the Magura has a blue (top speed) wire, a brown (wiper/variable) wire, and a black (zero speed) wire but in the Kelly manual it only refers to a throttle with a (+5v) wire, a (GND) wire, and a wire that says (OUT.) On the Kelly website they have a similar bike throttle but all it tells me is that the (+5v) wire is red and that the (GND) wire is black.