Condensation inside the gauges usually means the rest of the interior is damp. Stop the water from getting in first, then drive around with heater/blower on maximum and windows open (rear windows/sunroof if you have them) until everything's dried out. If you're getting condensation on the inside in the mornings, you can speed up the drying out process by wiping it off the windows first thing and wringing it out outside the vehicle.