Who said this would be plug and play? Unless that person was talking about a haltech I would expect it to be a royal pain in the ... As far as the indicators go, I believe that they are all sent on the CAN bus in different messages, so if you're really 'bout that life then you can make a device to monitor the bus and do whatever you want when you see the bits in the messages. I'm not sure if the gauge cluster does this or if it has discrete lines for each indicator, but I do know that you can get at them from the CAN bus.
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