My dad has a 2002 Impala that has the instrument cluster with a tach, speedo, fuel and coolant gauge. In 2004, you could get one that also had a oil pressure gauge and voltmeter. They put this cluster in the monte carlos also.
So I was wondering if it is as easy as just getting the newer cluster with all the gauges and putting it in there and maybe needing a different oil pressure sending unit for the gauge? From what I gathered so far, the connectors are definetly the same and the monte carlo and impala clusters interchange.