I did this a few years ago. You should be able to follow the power cable from the DMD on Iron Man back to the left of the backbox. You will find a 5V 2 pin connector (going from memory, I think it's 2 pins) there that connects to the 8 pin. Disconnect from the connector from the 8 pin and use the wiring harness that came with the LED DMD. Double check your voltages first but this worked for me on my original IM.