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>am interested in getting general info on air door system before i order a
>set.  Have never seen them and i own a 75  #1749.
>
>1  where does the air compressor go ?
The only one I saw was mounted on an additional plate welded to front bumper
extension.
>
>2  where does the air tank go ?
It gets welded to the backside of the rear bumper.
>
>3  is there an external valve stem to put in air just in case of no
>pressure ?
Yes, it's at the air tank, or you can run tubing to some other location.
>
>4  what happens to the electrical wiring from the hydraulic unit ?
You use it.
>
>5  how much work  ie: hours is involved in installation ?
Mine only has the the vacuum pump and I installed my system in one day.
>
>6  is the air or the electric system better  ?
What do you mean? If you mean vacuum pump versus compressor; I would
definitely get a compressor. The vacuum pump can't keep up if you make a
series of stops, such as running errands.
>
>7  are there any must options over the standard kit  ?
Only the compressor as far as I know.
GM
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