So I’d hook the following up from the fan: Red to Motor + and black to Motor -. Where do I wire yellow?

And by not hooking up blue, it would allow the fan to run full speed, but I could use the potentiometer dial to control the speed?

EDIT: here are some links to the components.

BFB1012VH 9733 Turbo Centrifugal Fan Blower 12V 1.80A Wind Capacity 979733mm https://smile.amazon.com/dp/B06XSCZJFL/ref=cm_sw_r_cp_api_i_.2ijFbREZWY9Y

uniquegoods 1.8v 3v 5v 6v 7.2v 12v 2A 30W DC Motor Speed Controller (PWM) 1803BK Adjustable Driver Switch https://smile.amazon.com/dp/B00QGMESHM/ref=cm_sw_r_cp_api_i_V3ijFb1VSA5FR

Maxmoral 3PCS DC-099 DC Power Socket Connector with Waterproof Cover Cap,Threaded Female Panel Mounting Adapter Power Jack 5.5 x 2.1mm https://smile.amazon.com/dp/B07S5ZLFDG/ref=cm_sw_r_cp_api_i_l4ijFbBG62K3E

This may not answer your question but you could try finding 12v 3a bulkhead connector on amazon and replacing the connector for one thats more commonly used. Like this one https://www.amazon.com/dp/B07S5ZLFDG/ref=cm_sw_r_cp_apa_i_PdI.EbQENCEM1

Then get a 12v 3a dc power supply to fit the plug