What causes gas gauges,wiper, heater, air conditioner gauges to not worksometime

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At times when I start my motor, the gauges all work fine (gas, wiper, heater, air conditioner). But now and then when I start the motor the gauges do not move and I get nothing. The air does not work, or the heat, or the wipers or gas. What is causing this? I have checked for loose grounds and loose wiring.