general problems of the 1999 Chevrolet 1500

After filling up my truck and got speed up to about 65mph my gas gauge went to empty and then would come back up after hitting a bump in the road or rocking the truck back and forth , also the light on the gear shift lever kept going out and couldn't tell what gear I was in, could peck on console and light might come back on but stays off most of the time now. Now the fuel gauge still acts up and it does not give and accurate reading. Have to set my trip timer each time I fillup so I will know how much gas I have unless someone steals a lot of it then I usually run out of gas along side the road. [xxx] information redacted pursuant to the freedom of information act (foia), 5 u. S. C. 552(b)(6).