Recreational Vehicle Lpg Tank Valve/gauge problems of the 2004 Infiniti QX56

My gas gauge is always not correct. I only rely on the time and how much I filled it. Several incidents that it didn't start, even the gas gauge in the dashboard says its full but it's empty. I did talked to the mechanic he told me that there's a recall for it from the national safety but every time I brought my vehicle the dealer will deny it and says that the VIN number says no history of recall. The speedometer and rpm not reading accurately, the dealer says I have to change the whole dash board, but when I went to the other mechanic he says it's the ipdm and on I was googling about any recall for this problem and found it to your site about recall but the dealer again says there's no recall in VIN number. In your website it seems like the engine and engine cooling which I paid them to fix it. Engine light is always on, the mechanic says about exhaust manifold need to be replace, Nissan material can break easily. I spend more the $4500 fixing this and that. Excluding the expenses that I had from the dealer shop.

When driving vehicle suddenly makes a loud grinding sound and abs and brake light come on on gauge. When trying to break it is impossible. It will not stop. This has happened more than 6 times already. Thankfully I was not in traffic or collision and injury could have happened. In order to regain control you have to turn vehicle off to reset it. This problem may cause a severe injury or even death.