V4 gap/no gap this is the bios chip on your ps2 (where the MNOP connections go)
heat sink on the modchip is not necessary........do note that the installation process is complicated and you can mess-up your ps2 easily
32-30 awg is recomended for data
24-22 awg is recomended for ground and power
28 awg for data should work fine, just be a bit more careful on the bios chip since it's a little thicker than 30 awg.