You can easily make a harness
Only tap into the power harness going to the motherboard
Do not tap into any of the netplex ports on your motherboard, you will end up replacing your motherboard.
I had to replace my motherboard after using a Netplex port for back lit controller power
That is why the latest versions of the S2000 have 2 power distribution boards, one in top box and one next to back lit controller.
You need a Molex Mini-Fit Jr 2x3 male housing and female connectors
If you have a dead computer power supply with the 6 pin GPU power connection, salvage the gpu power harness from it.
Do not tap into any of the netplex ports on your motherboard, you may end up replacing your motherboard.
Here are the pin outs
Pin Desc IGT wire colors in the power harness
1 25V orange
2 13V red
3 13V red
4 BGND black/orange
5 AGND black/red
6 AGND black/red