The gauge for oil pressure shows the usual 40 but the light with the wrench next to it stays on for 20-53 seconds after starting the vehicle then it goes off. Is it urgent to get this checked or can I wait a few days? It just began doing this yesterday.

the air is cold but cannot change air to work thru dash vents

looking for replacement harness, gm has none available. any else have this trouble?

I have a full size van with 4.3 that will not fire up i have had the fuil pump ,Dis cap Roter , ecm and still not but i will run if i squirt starting fluid in the intake