Late 90s ezgo txt with bandit motor, questions on upgrades

I have a late 90s txt that has a plum quick bandit upgrade. I want more torque for the hills where i drive around town (i lose 10mph or more on most hills) ive been researching and know ill need a new controller, solenoid, and potentially FnR switch, and move from 4 to 2 gauge wiring.

However, i cant figure out what i need. Im looking at alltrax but i cant figure out which will work best for my setup. Can someo e point me in the right direction. Too many different part numbers.