Electronics Repair Questions? Ask an Electronics Technician
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Generally speaking, with dash-mounted device (though it may depend a lot upon what car or truck you have it in!) you get down on the floor with the door open, and look up under the dash devices, undo a fastener or two there, and push the device(s) out of the dash from behind. You may also have to undo wire connectors, perhaps - if you do, note them down for sure and without mistake! as to how they go back.
Let me know how it goes, or if you need other advice.