A wigwag style throttle like this works by having 0-5K ohms resistance in one direction, 5K-10k in the other. 3 wire.
Roughly 5.5" on the longest dimension, requires 2" mounting hole, approx. 240 degrees of travel.
When purchased with one of our boat kits, if the motor is spinning the direction opposite throttle lever direction you can simply unplug the throttle, reverse the orientation of the connector, and plug it back in. Very simple!