If you're talking VR/VS era harness, then yes, you can leave the ABS leads unplugged - base models with the 2nd level wiring harness (for factory cruise etc - as used on the S models) that never had it fitted simply had the ABS plugs hanging loose.

The SRS airbag loom eminates from a yellow plug in the harness near the underdash fuse box. It's easy to spot, as all the yellow wiring runs airbag stuff. Simply unplug it from there, and it's gone. Again, VR/VS without SRS airbag simply had nothing plugged into this plug.

You can't do it as easily with VT onwards, as they run a CAN-bus system, where the modules all communicate, but VR/VS are still a simple system.

The only headache you'll have is the security signal from the BCM to the PCM. Known as VATS. It won't let the car start unless it detects the right signal from the key head. You can get VATS removed from your PCM quite easily by any of the competent "tuner" guys who can offer a replacement exchange memcal.

How did a blown V6 end up in a VU? Is it an aftermarket fitment? I didn't know you could option the blown V6 in a VU, never seen one!

Hmmm, who knows what was done to "convert" the VU to a supercharged 6? Did they simply do an engine top end swap, engine loom swap, and PCM change, or did they do the whole job properly - fuel pump controller, torque convertor clutch removal etc etc?? It may already have VATS disabled, as from VT onwards the PCM & BCM need to be paired for VATS to work properly.

As far as the stuff all interacting - the VT-VU-VX era V6 uses the PCM for a lot more functions, and the dash cluster is also driven off the PCM too.

Cruise on one of these is easily added if you follow the VR/VS cruise wiring.

Me personally, I'd avoid all the hassles you're setting yourself up for, and find a cheap wrecker VS statesman that was a factory supercharged 6, and get all the bits from it (loom, fuel pump controller, PCM, BCM, cruise etc).

Otherwise you're in a world of pain with the VU stuff and the CAN-BUS communications that interlink each other.

That makes a lot more sense (the VU was the ute equivalent to the VX).

Cruise is the easy part - it only references a speed signal from the PCM, and the rest is all done in the module (and with the switches). The BCM controls the on/off latching from the momentary switch on the wand, but if you're not keeping the wand, you can fit a latching on/off switch, and a pair of momentary switches for accel/decel.

I don't think he truly understands the CAN-BUS implications.

Probably a VX S-pack, which would have had standard cruise, and could be optioned with the Supercharged 6.