The check gauge light on a 2000 Chevy Blazer could be several things. The oil could be low or the other fluids may be low.
Take notice of all the gauges. One or more may be out of its normal parameter notifying you there is a problem.
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The 2001 Chevy Blazer does have an ignition security system that is controlled by the computer in the vehicle. The light might come on because of an error that is coming up in the computer due to a key problem or an ignition problem. This is a common issue with the 2000 and 2001 Blazer.
Most fuel gauge problems are the result of a faulty fuel gauge sending unit located in the fuel tank.
Check for a loose connection Check for a loose fuse in the fuse box Check for an open wire in the brake light circuit
The fog light bulb on a 2004 Chevy cavalier LS sport should come on when the lights are activated. If it doesn't, first check the fuse for the fog lights, then the bulb, and then the switch. One of these things is likely to be the cause of a light not working.
Need to check the EGR valve. It sounds like it is opening to quick.