Dodge Repair Questions? Ask a Mechanic for Answers ASAP
Are there any trouble codes stored?
Will it at least crank?
While running, what is the battery voltage?
While running the voltage must be between 13-15 volts. Since you got a 12 reading, that is to low and indicates the alternator is weak. The only reason I mentioned this is because low battery voltage or surging voltage can effect the operation of the gauges and lamps in the instrument cluster. Can you monitor the PCM/ECM inputs and outputs to see the tach and speed readings.
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Do you have access to a diagnostic tool that can see the readings and functions inside the PCM?
The PCM/ECM is the vehicles main computer. This tool is expensive 800$ or more. You would not want to buy one. It may be best to let a shop do this part of the diag and repair.