You need a pod to hold the guage.  It mounts on the A-Pillar and you
paint to match.  Looks great.  Mine is electric.  The sender is
installed in an aftermarket Mag-Hytec tranny pan.  Others prefer to put
the sender in the line.

Geno's Garage has mounts that will work with the Stewart Warner gauge. They
even sell the paint.
http://tinyurl.com/8ar4g

--
Ken

   Gauge panels are pretty easy to make of sheet metal, wood, plastic, fiberglass,
etc - pretty much whatever you have lying around in the garage.  Use you imagination
and put it anywhere you want.  You don't need to monitor it all the time - like oil
pressure - so it can even be low on the panel or down by the cup holder.
    As for type, I generally prefer electrics, but only because they are easier to
install.  The mechanicals have a 270* sweep, and the electrics have a 90* sweep;
although AM is now making a limited series of electric gauges with a 270* sweep.
Bigger needle sweeps are easier to read at a glance.  If it's going to be down near
the floor or on the other side of the dash, use a larger 2 5/8" gauge with a red
needle - they are very easy to read at a glance.
     Autometer has been my favorite for many years.