Recreational Vehicle Lpg Tank Valve/gauge problems of the 2007 Chrysler Town & Country

My gauges started going crazy. The abs and brake lights came on. The heater and radio went off while this was happening. At times the van just cut off in traffic but so far I'm able to start it up again. Was told by rick hendricks Chevrolet service dept that I needed to an alternator. Had a new alternator installed by b&b automotive along with a tensioner. Van still doing the same thing. Also, when the gauges start going crazy, they make a tapping/ticking noise. I replaced the battery in October or November of last year because the van at times did not start. . On one occasion when I had trouble getting it to start, the next day I took it to gerald's tires and brakes who told me I needed a battery. This morning when I approached a stop sign and stopped, the van cut off but fortunately I was able to start it up again. This happens when the van is in motion. Happens just about every day because I drive to and from work. I limit my trips to get groceries or do any unnecessary driving because I'm afraid of the van cutting off in traffic.