Ratings for power distribution are much lower than for chassis wiring which is a closer fit for what the wiring on a jackpot installation is.
Take a good look at an ampacity chart like this one:
When I put the Jackpot on my JL1 laser, the factory JL1 12V power supply had tiny wire AWG- 20 or 22.
I replaced it with a better harness and went up to 16AWG and an E1508 ferrule, which I consider massive overkill. That was a tight fit in the Jackpot board, I don’t think you’ll get any bigger than that in a crimp ferrule in that board.
The post where I put that on is here: