Hiya Darren mate,
We only tried it a few times but got this error;
When reading the mileage it read it fine.
Then when clicking 'Read Security Access Code' for my old dash it worked fine (960 version midline)
When I had the new dash in, it just came up when I tried to read it;
"Security access code not found!Reset instrument cluster and try again"
I tried that, it made no difference :( Maybe they stuck the IMMO4 in a few earlier 972's?