Message Center problem in 2002 Duramax

This morning, the Message Center flashed alternatly "Check Oil Pressure", "Low Coolant" and the red battery light. The oil pressure gauge has not worked for months and the dealer said "don't worry about it". The oil level is normal, oil is regularly changed. The coolant level was perfect and the batteries are only six months old, Interstate batteries, and the battery gauge says 12 amps. Normal position. So is the Message Center having problems??:screwy: Otherwise, she runs perfect!! Thank you for any advice before I deal with the shop...