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my friend has a 2003 cavalier, nothing on the dash works, no speedo, tach, fuel or temp gauges, could it just be a bad ground somewhere or a fuse/relay?
There are two fuses that affect the instrument cluster in that model. Fuse #16 is labeled CLSTR and fuse #3 is labeled BCM/CLU. Use a fuse tester or replace with a known good fuse because fuses can often look fine even when they're blown.