Fairmont oil pressure gauge too high?

[AC]

The mrs took the AU off to her mums yesterday(Sydney-Mudgee), she rang me up because the needle on the oil pressure was showing up into the RED, not the whole time. But was quite regularly high up or into the red part. All the manual says, is be concerned if it goes too low or down completely.
I usually only remember seeing around 3/4's when i drive the AU.

Those who know the roads, Sydney to Mudgee will know that its quite diverse driving, lots of huge hills/mountains to high speed zones to drive in, so i can understand the needle moving up and down with the drive.
I just dont know if we should be concerned or not?

For those unfamiliar, here's a pic i stole off ebay :P
Top Left gauge.