What needs to be replaced or repaired when all dashboard gauges go out?

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Recently I replace my car battery however a couple months later it went dead my roadside service said that it was my alternator took it to the shop. shop said that my alternator was fine and couldn't find a problem. A couple weeks later my car went dead again. Roadside came back out again and said that the cables connected to my battery wasn't tight enough. After tightening them again, they worked fine for a couple of days but every couple of days it comes loose and the car dies again. This last time I tighten it again but when starting my car the gauges didn't work, the speed, the gas or the dashboard monitor just did not work however the lighting in the gauges does work and my radio and all other lights do work.