Suddenly my oil pressure gauge reads at the max as soon as I turn on the ignition - is this a sender problem and how do I test for it?

The screen on my original equipment Becker radio simply went blankwithout warning,seemingly taking with it the auto aerial function and the dash clock. I checked the fuses under the hood and they appear ok-suggestions please..
I know the radio and aerial are linked but the clock too?

Any and all help greatly appreciated!