My 1993 Chevy lumina did the same thing i ended up having to get a new battery it turns out my factory radio was the problem : - )
Install a manual gauge to check actual pressure or try Replacing oil sending unit
No. Not visably
could be a bad TPS throttle position sensor OR a bad IAT idle air control temp sensor.
One of the bulbs is burnt out.
The 2001 Lumina has the OBDII system. The only way to access the data is with an OBD2 reader (about $120 ) from any FLAPS (Friendly Local Auto Parts Store) Or you could take the car to a dealer and pay them to read the codes. Purchase the Haynes manual for the Lumina so you can look up the codes and figure out whats wrong.
maybe only for 1 minute or two If it stays on beyond that try to push the clock button while everything is powered off to see if display goes off
It changes constantly. But stays from $0 to $3 ruffly.
Maybe bad ignition switch
You can't, unfortunately. He stays there constantly.