Exactly. The pot controls the speed. The switch is forward, off, reverse. Here is a link to what looks to be the same one I bought. Costs about $9 with switch and pot. It is even wired up to the pot and switch.
Here is the link:
DN Reversible 6V 30V 6A Pulse Width PWM DC Motor Speed Controller Governor | eBay
Cheers, JR

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