Sup boys, I will post my bench setup which I am using on MS42, because there is no basic tutorial how to do it..
It took me a while to figure how to make the wires, but here it is.
IMG_4853 - This is my setup, I am using motorbike battery 12V, works great.(it is not complete, 1 or 2 wires are missing)
IMG_4861 - Blue(pin 6) - ground(goes to battery -), green(pin 3) - KLINE goes to INPA cable (pin 8 ), 2 black (pins 1 and 7) - battery positive
IMG_4860 - KLINE (pin 8 ), Ground (pin 4 or 5) - battery negative, battery positive (pin 16)
IMG_4854 - INPA cable settings, I tried it with latency 1ms, but I was getting "wrong echo bytes" error, so I switched to 16ms and it works great.
You will need 1 more wire to connect boot pin, which goes from battery negative. I am also using clamp attached to battery positive wires and I connect it to battery positive(easier than screw).
I am using JMGarageFlasher and everything works fine. When you connect all the wires, connect to the boot pin, clamp battery positive, count 6 seconds and disconnect boot pin, hit connect in JM, it should connect and you won

I dont know if this "tutorial" is understandable enough to make your wiring harness, but I tried and it is working for me, if you have any questions feel free to ask.