Geez, calm down.
Aloha... : huh? A boost gauge on a diesel is comparable to a vacuum gauge on a gasser, fueling still roughly corresponds to intake manifold pressure. In a turbocharged engine you want to minimize your boost for the additional pumping losses created by accumulating exhaust manifold pressure to attain that boost, too.
But I suppose it's mostly for turbo safety when driving like an idiot. Is that what you meant?
