[casioqv]

If your goal is to see the true oil pressure at high rpm you'll need a gauge with greater range, but if your goal is to ensure that you have sufficient oil pressure to provide engine lubrication (which is usually a concern only at hot idle with worn bearings barring a sudden failure or oil loss) then the upper areas of the range are irrelevant.

To be honest, I've never quite understood the reason to have an oil pressure gauge since as long as the oil pressure is high enough to turn off the idiot light, then it's sufficiently high for proper lubrication. I have an audible buzzer wired to my idiot light so if I suddenly lose oil pressure I can shut the engine off before damage occurs. I doubt I'd notice the level on a gauge quickly enough after sudden catastrophic pressure loss (oil cooler failure, oil pan failure, pump failure, etc.).