A wigwag style throttle uses a potentiometer with 0-5K ohms resistance in one direction and 5K-10k in the other. It has a 3-wire connection to the controller, and requires controller programming before operation. Thunderstruck provides this service when the throttle is ordered as part of a kit.
Throttle dimensions are roughly 5.5" on the longest dimension, requires a 2" mounting hole, and has approximately 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!