The guy was very specific meaning that they are offering you a better price because it has guages etc fitted as opposed to a standard car. That doesn't mean you can't strip it all out!!
Don't leave it in. It will be a crime. When ours was smashed up by the dirty low life, hope they are dead, wan***s who nicked ours and the wife went to look at it she went around the car taking off anything that was still in working order (Although admittedly that wasn't much []), no-one batted an eyelid. Either at the breakers or the insurance company.
At the very least let Mark strip it out. At least then you'll have a clear conscience []