2005 GMC Savana 1500 Questions

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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?...
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