Penn & Teller covered this in an episode of Bullsh!t. Test pilots who undergo high 'g' training report many of the same experiences of those who have had a near death experience. The g-forces force blood away from the brain, causing the same kind of starvation effect.
IANAL, but it seems to me this is evidence no different from a security camera in a bank or some such.
If the defense wants to argue that it's been tampered with, they would need to provide proof of such in order to get it not admitted. They can question it's validity all they want, but that won't prevent it being admitted into evidence.
Take a look at this screen grab. I've circled the left turn control signals. They're clearly red as the car is coming into the intersection.
Nice. I wondered if anyone would pop up older than me. Good to see you
879048 is old? Who knew.