Oil gauge + digital Mph gauge

[R33P]

Hi all, I just picked my 2004 Boxster up yesterday and I have a couple of quick questions. No. 1 when I first put the key in the ignition the oil gauge builds up & displays the level but depending on where & how the car is parked it can vary from full to a quarter. Is this normal or is the gauge faulty. I have checked the dip stick & I think it was 3/4 ish? Shall I top it up?

Next question; I noticed this morning that the digi fuel gauge was not working correctly it only displayed the top 2 lines but after driving for a few miles the full numbers slowly appeared, is this a fault/faliure?

Your expert help would be really appreciated.

Cheers, Craig.
Boxster 2.7 - 2004 - 29,000 miles.