Ran across this thread looking for install directions and was a bit confused regarding reference to three wires. Axisboldaslove mentioned that there were two black wires, one for ground and one for power as well as a red wire for tapping into the MAF. I figured out the install myself and it's working fine, but my particular model just has two black wires. One for the MAF/ECU tap and one for a ground. Just wanted to clarify this in case anyone has my particular model of the FCD as it seems there are more than one.