Recreational Vehicle Lpg Tank Valve/gauge problems of the 2007 Ford Expedition

As soon as you start the vehicle the battery symbol displays on the dash, it goes on and off chiming repeatedly, then switches from battery symbol to wrench symbol and then my entire gauge cluster starts. Every light goes on and off repeatedly, the rpm gauge and mph drops to zero and the engine clunks really loud (while driving), the ac or heat will completely turn off and on, the headlights flicker and dim on and off at night while driving, bad vibration, loud growl type idle sound, the radio shuts off, when you turn the heater on it repeatedly clunks in the rear of the vehicle until you turn ac on again or shut it off, rear air suspension light goes on and off while driving. This all happens whenever it wants. I shut off the car and restart and the problem will stay gone and drive normal until it cools again and then restart the vehicle. This vehicle has been tested at 3 shops and turned away by all because they don't know where to start as they are scanning the vehicle and 17 codes came up. They started testing each item with a code and all came back as functioning properly. So I believe it's either electrical or one of the brains/computers of the vehicle?. It is becoming a safety concern and I need help.