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just went thru my diags and also spoke to guy at holden

a gen 4 6lt has one small harness which does some sensors and the injectors and coils on the engine

the 2nd harness does the black plug on the ecu and also does the front of the car and under the dash

the black plug has wires for all these ...............

engine relay power
start relay
fuel pump relay
vehicle speed sensor
mass air flow sensor
the 2 rear o2 sensors
accelerator pedal sensor
thermo fans

so basically everything i just listed for the black plug will have to be made up
i will get all the parts needed to make afew of these looms and keep u all posted

i can buy the black plug straight away if needed
i will make a list of the other plugs needed on the engine as listed above

if u can go thru the above sensors i have mentioned on the black plug
and let me know what you need
if you do get a mafless tune fitted to your ecu then u dont need the mas air flow plug either

thanks

jim