If you know anyone that does fiberglass work i would remove the unit remove the gauges and fiberglass cloth on the face of the plastic. Fiberglass cloth dries crystal clear. If you want a flat surface you will have to apply additional coats of resin but when done it will be as flat as glass.
Fiberglass also hides the cracks.
The mailbox was glassed before painting
WBCCI 12156 AIR 3144 WACHUNG TAC NJ6
2004 Excursion 4x4
1991 34 ft. Excella +220,000 miles, new laminated flooring, new upholstery, new 3200 lbs axles