Our oil pressure dummy light is going to be more effective than a gauge. People don't usually watch the gauge. Factory gauges are usually pretty crude as it is, in some cases, they'll read the same (in the middle) as long as its in the safe limits. If the factory gauge drops, most people aren't going to catch it until it's too late (ie: motor stops running) unless a dummy light comes on. Gauges don't usually have a scale, either (or maybe I'm not driving the right vehicles) so it's a guess at best where the pressure actually is.
When our pressure drops, the dummy light comes on, and it's tough to miss a big red warning light on the dash while driving. I think the pressure has to drop to a ridiculously low level to even trigger it, and in most cases, it's going to be too late anyways.
That may be more than you were asking, but I'm just trying to get the point across that we aren't missing out on much and have nothing to be jealous of.
I guess maybe the correct answer would be, "Mitsubishi was too cheap." /ubbthreads/images/graemlins/hsugh.gif