I got a spare speedo gauge before. If u have a 3.4L .. and 2.4L or 2.2L engine one will not work completely. When I plugged the 2.4L i got off of ebay.. the alty light stayed on 24/7. But everything else worked fine. And whatever mileage is on the cluster is the one is gonna appear when you plug it in since it is stored there. But also the BCM has some stored I believe also.. for incase warranty work or something if they use the can tool.. they can tell if you switched clusters.
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I dont have an alero no more...
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