i put a 2.5" one in the dummy air vent hole to the left of the centre gauge cluster on my wifes 83 Grand Prix. fit's perfectly in the factory hole, just pop out the dummy air vent. and slide it in. if you want, you can use a dremel to make some divets in the cylinder of the tach for the clips in the dash to grab. once you pull the dummy vent out, it's pretty self explanitory. the steering wheel kind of obstructs the view, but it looks pretty stock, and it's a good use of that previously useless hole.
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