Hey champ
You and Dimitryl should totally exchange numbers
jks hehe
You need to short the black to pink for cruise, but I don't think the throttle switch is the best option as it is a push on/off type.
If you did connect to the throttle switch, you can wire the black from controller to the brown throttle switch wire. The yellow would then connect to the pink wire completing the switch circuit.
Just remember if you do it, you will need to push the switch on, then off again in quick succession to enable cruise control.
Because it's a momentary switch, I'm sure you have one lying around you can wire it elsewhere. For example, I modified my thumb throttle to have 3 additional momentary buttons I use for volume control and a kill switch lol
I have a button on top of my GM 48v battery pack (top one) that enables cruise, and another on the front that activates reverse.