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1997 cavalier that you had to change the gauge cluster After installing new one theft system light comes on and wont let car start Put old back in it right away?

Yes, immediately putting the old gauge cluster back in is the correct troubleshooting step. The theft system light coming on and preventing the car from starting strongly suggests a problem with the immobilizer system, and the new gauge cluster is likely interfering with it. The immobilizer system often uses a chip or transponder in the ignition key and the gauge cluster to verify authenticity. A mismatch between the key and the new cluster's internal components could be causing the issue.