Kilby Enterprises sells a bracket and AC pulley to add a York compressor
when you have AC.
http://www.onboardair.com/
as someone else gave. This site also has links to diagrams for what you
need for an effective OBA system and tells you which Yorks are the HD
version (210) vs smaller versions.

Airflow from an electric compressor is usually minimal but effective if you
only plan to use it to air up tires. If you want to run air tools, use a HD
AC compressor(with air tank) or CO2. Look for sites of people making their
own CO2 setup as well.

Good luck and do your research. It's a good upgrade.
Mike

"DougW" <post.replies@invalid.address> wrote in message
news:mRt5b.117121$Ij4.42618@news2.central.***.net. ..
> kid4lyf wrote:
> > I've seen several articles about using an AC compressor to power an
onboard
> > air system. Great ideas but each one I've read about replaces the
factory
> > AC. I don't want to lose my AC. Anyone know of ways to do this while
> > retaining the factory air?
>
> Quickair
>
> What model of Jeep?
>
> --
> DougW
>
>