Here's my experience. Mine was showing the same on the factory gauge, too. I finally gave in and bought an Autometer gauge.
25-psi @ idle
60-psi @ speed
All with 100,000 miles on the engine. Now the stories a bit different, 15 at idle, 40 at speed (40,000 miles later). Yep, I'm getting it rebuilt next week.
My McLarens never budged. 3/4 mark at all times. After the new gauge it shows, 30 @ idle, 70 @ speed.
My advice is to take what the stock gauges show with a grain of salt. Peace of mind is worth the new gauge, even if it's a cheapie from Wal-Mart.
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Robert
91GT; 88 ASC McLaren #709
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