My '97 S500 has two issues-
First my oil pressure gauge reads 3bar (full scale high) almost all the time. The gauge dies when the car is shut down. Once and a great while it will read what I assume is normal, that is about 1.2 bar at idle and quickly rises to 3 bar under load. I'm asuming it's a bad sender. Correct?

Second, my outside air temp reads normal at all times except when the car has been idling for about 10 minutes without moving. The display then blinks a few times and then blanks out - no display at all. As soon as you start moving again it comes right back. Wierd. Is this normal or something more sinister?

Thanks in advance,
Paul Hansen