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Huh. That's a good question. The SG gets its data from the ECU, and so does the gauge cluster for the most part. I bet one of the two wire harnesses entering the cluster is loose or damaged.
Check out the diagram on p 22-62. Bad grounds would disable all gauges equally. The gauge cluster CPU is supposed to receive vehicle speed data on wire A19, but if it doesn't, I'd expect a blank speedo and no mpg display. Similar story with coolant temp, which must be transmitted on one of the five wires labeled "ECM".
As to your IMA gauges, that's because your IMA has fatal trouble codes. Right?
Is there a chance you damaged traces on the gauge cluster while transporting, storing, and installing it? Unrelated: Do the relevant LCDs light up during the lamp test?
Hmm, that circuit diagram gives me an idea. One of those wires feeds the gauge cluster instantaneous fuel consumption data, and hopefully at a high sample rate. If I do a permanently installed DAQ in the Insight, that's a channel I definitely want to log.
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