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Only thing you have to unhook is the fuel tank selector valve. You don't pull the whole dash. Just the black bezel around the gauges.
When pulling the dash cover. There are a couple screws hidden under the trim on the lower part of the dash, and it is NOT uncommon for the plastic tabs for the screws holding the fuel selector switch to break. If they do break though, its not a hard fix. Get a couple panhead allen bolts (number 8's about 1 1/2" long if I recall correctly.) Drill out the dash from the backside, thru the old screw tabs, then run the allen bolts thru the dash from the front. remount the switch with nuts on the back side.
Here are pics of the ones I used. Only thing that sucks about ordering them from ebay is they come from China. Takes me 2-4 weeks to get them but ive gotten every LED in my truck(every bulb is LED) from ebay.