I have a 30-pound, 5-speed Minn Kota trolling motor. I'm wondering if there is an electronic part I can put in the circuit that will allow me to have more control of the speed between off and the first speed.

Here's a potentiometer that I'm thinking will do the job: MLCS router speed control and Foot Switches

I know this device is set up for AC, but will it work for a 12 V DC motor? Any thoughts appreciated!

Thanks!