2008 Jeep Liberty warning lights coming on

I have a 2008 Jeep Liberty and for the past few months all the warning lights on the dash have been coming on, check engine light, ABS, Brake light, airbag light, ESP light and after a while they would turn off. Now all lights are on again and the speedometer and gas gauge doesn't work. And the automatic door lock system is not working. My husband and I are on disability and don't have much income and I am afraid that this is going to be a costly issue and after reading comments on people with some of these problems am also afraid that mechanics won't be able to figure it out. Any help with where to start would be appreciated! Anybody have a 2008 JL with these problems?
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