I'm using a Xg harness, au 4.0 litre, running a xg dizzy,,6dbd hybrid ecu,, smart lock bypass,, going into a Xb,,, no crank angle sensor, do I only need live power,, earth,, accessories ,, to the ecu to run the ecu???? Any advice????

I believe you need constant 12v from the battery, starter signal and engine run signal (both taken from the back of the ignition barrel.