I have an 04 2500 that the instrument cluster has started acting up on. it will work sometimes [no sticking gauges] and other times all the gauges will be dead. Ive tinkered with it and they will seem to work fine and then when I turn the key back on, NOTHING. I'm pretty sure its not the stepper motors because, when they work they work fine. Could it be the ignition switch? I don't want to send the cluster off for repair and that not be the problem. thanks.