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Ok what is it what problems could it bee. I have all my Gauges working and they all are still in the norm for my D. WTH is it I have NEVER seem a Check Gauges dummy light..
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usually when it blinks on it is the coolant temp getting high(and then coming back down), or the battery voltage getting low(or high) and then coming back in range. the last thing would be the oil pressure disappearing.
If it doesn't start the diagnostics immediately, hold it down with the truck in the on position until words appear in the odometer, then let go an let it run :-)