Instrument panel not working, engine shut off while driving

My car wouldn't start without a jump, though the battery was only a few months old. I had the battery replaced and drove 2 blocks when it shut off and wouldn't start. The mechanic checked and said it was the fuel pump, so he towed it and replaced the pump. The car still wouldn't start, and he said the ECM was bad, so it was replaced. Still wouldn't start and he said the BCM was bad, so it was also replaced. He said the car wouldn't accept the re-learn process, so I had another mechanic get the car. He found they had broken a part while replacing the fuel pump and the car wasn't showing it was in park. He repaired this and it started and runs fine. However, the instrument gauge still isn't working (it worked prior to all of this). The mileage does show, but it's registering. I'm hoping this is something I may be able to repair or at the least, not get taken again (the old BCM was still in the car and the second mechanic said it tested fine). I would appreciate any help.