HELP 76 dart gas an temp gauges wont work!!!

Get the cluster either on a bench so you can wire it up to a battery, or hanging out the dash, difficult. Measure the voltage from the battery connection to the VR and make sure it's same as battery voltage

What are you using for a VR?

That is, is this a quality "solid state" replacement, or a parts store deal, or what?

Did you check the other stuff in my earlier post no4?