I just swapped out my T1 with a T2 this weekend. Understand they’re a little better at dissipating heat and are generally a better controller.
You need 3 parts -
0106-00678 ASSY, WIRE HARNESS - SPLIT HEATSINK JUMPER
0106-00827 ASSY, WIRE - SPLIT HEAT SINK JUMPER
0606-00176 CONNECTOR, T - WIRE
The harness will convert you from 8 pins to 12 for the gauge.
Split heat sink and T-Wire will take power from pin #2 and run to pin #23. Without it you’ll get error code -90. (give credit where credit is due, grant had an earlier thread about this).
I got my parts from www.gemcarpartsdirect.com. Dealer prices so I think it was around $150.
Once I got the controller in the car, used the programming cable and software to push all my T1 settings that R4F had configured for me when I bought the upgraded motor. I’m in a similar boat in that I had 2 T2s I wanted to test, I ended up just putting them both in and driving around for a bit to see if I got any faults.
I asked the guy who sold me the cable about bench testing, his guidance - “you just need pin 1 feed…Plus power to the controller, you’ll need ground on the large Battery negative bar and at least 24 volts to Pin 1 on the main 23 pin plug. On the controller itself for power.” I never tried that and figured it was just easier to throw it in the car.
Good luck!