I used a LEDMOMO 1203BB 6V 12V -
https://www.amazon.com/LEDMOMO-1203BB-Controller-Adjustable-Reversible/dp/B07BLWXXQC/ref=sr_1_1?keywords=LEDMOMO+1203BB+6V+12V&qid=1576590400&s=hi&sr=1-1
You can connect directly to the motor with this controller. But you do need a 2 pole ON - OFF - ON switch...