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The new one may not be working because the dashed have to be programmed to the trucks. They have modules in them and the software has to match up or you will get a dead dash.
You are getting all the readings on the laptop indicating the vehicle module is getting the signals. That is good. You are just not getting it to the ICU module which is the dash. The link is either bad, the ground is bad, or the dash is not programmed. Try programming first since it is the simplest. Otherwise the harness will need to be pulled and checked over to see where the loss is and that can take some serious time.
Usually when the dash goes dead, it is the module in the dash itself and then a replacement is done, then programmed on the truck.
Oh, Alsmost forgot, if the gauges cycel when you turn the key on, you have power and ground to the dash. If you don;t, there is no power to the dash and that needs to be resolved first.
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