'89 100 oil pressure warning. Electrical wierdness or big problem?

[tom winter]

Scott - thanks for the fast response. Oil level is correct. Oil was 10/30 -
Just changed it and put in 10/40 but haven't driven the car just idled it
until it got fully warm, checked for leaks (none). The oil temp stayed below
the middle of the gauge, engine temp pegged at center of gauge and oil
pressure just below 2 bar.

Tom