Recreational Vehicle Lpg Tank Valve/gauge problems of the 2003 GMC Envoy

2 years ago the maintenance required light has been on, when checked by 2-3 mechanics they said it could be the gas cap. That didn't remedy the situation, the light stayed on, then recently the fuel gauge started dropping to empty after a little less than half a tank was used. Then filling the gas tank caused it to overflow if you fill it to full. As of today the car when shifted into reverse, something came loose inside the shifter, now it is stuck in neutral.

Gas gauge is not working. Amount of gas in tank unknown due to this error, not only making driving unsafe, it is also a major inconvenience. We have replaced fuel filter in gas tank and problem still persists. Now our mechanic has suggested a new imstrument cluster. . . . . $500 later will it be fixed?' all the while GMC knows of this problem.

Driving the vehicle on the highway at approximately 75mph, gas gauge went completely down to e with a full tank. The needle was basically reading in the same position as when it is in the off position. After that happened the vehicle speedometer started reading incorrect speeds I will be at a dead stop and at a stop light and my speedometer will be reading 75 mph stuck. I know there was a class action lawsuit in 2007 approximately and listed certain gm vehicles but this one was not included. I think that gm needs to look at this affecting other models and makes they replaced some vehicles with this issue and the problemt lies with the step motor in the cluster gauge. If you take the gm dealership they want to charge you $500 dollars to repair on a issue that is beign replaced on other models. Please please get this to be recall this is a issue that will cause someone to get hurt very bad in a accident.