They are not too hard to do. I have had several complete dashes out to replace the main wiring harness when I was a tech at Nissan. One dummy put a 30amp fuse in a 20 amp slot for the radio. It melted the wires all the way from the fuse box to the radio. LOL I replaced a heater core in a 1986 300zx. That also required the complete dash to be removed. The amount of vacuum dash pots to run all the A/C, heater, and blend doors is crazy.
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