Recreational Vehicle Lpg Tank Valve/gauge problems of the 2005 Chevrolet Silverado

The dashboard cluster went out, speed odometer stuck on 60mph. Had to race motor up until it red line returned to 0. The entire electrical board stopped working, found out was a recall but my VIN was not included. Spoke to autry morlan dealership several times. We paid out of pocket to have replaced and that cluster has done same thing. Still no recall on our truck. Will cost another 200-300 to fix out of pocket. Gas gauge does not work, speed odometer does not work. Rpm will work and that is how we judge our speed on truck.