I believe your dash uses a regulator to control your gauges. It is a switching regulator that converts 12V battery to 5 Volt reference voltage for all of your gauges. They are notorious for failing but usually not in this manner. They were used on a wide range of Chrysler vehicles and very easy to find. RT-Engineering makes a modern version that is much more reliable and has protection to keep your gauges from burning up.
I would recommend you check this right away: if there is an over voltage situation it WILL fry your gauges.
Craig