How to Make Custom Gauge Holder
Using the space presently occupied by center trim and useless cup holder
This may not work with center consoles from automatic transmissions. 

    The first step is to remove your center trim from the car, so you can make a template.  First remove the shift knob, which may not come out easy.  Mine was impossible to move when I first got my car but for usage it became easy.  After the knob is off grab the center trim through the shift boot and pull up.  It should unsnap easily and pull over the shifter.

    The next thing I did was trace the trim panel onto a piece of masonite to create a template.  This is important to get the right fit.  Later the new trim panel will be made out of plexi-glass that is not as easy to work with.  All you fine tuning and test fitting should be done on the masonite leave it a little loose.  Be sure to mark the top as it will not be symmetrical.  It should look something like the picture below.

After a good template is made and fits a little loose. Trace it onto a piece of Plexi-glass.  The plexi glass is very hard to cut so use a new jigsaw blade and go slow.  I would recommend cutting the shifter hole first so it's not so flimsy.  Once the plexi-glass panel is cut properly sand it smooth on the outside and test fit again.  You'll notice that your piece is flat and the hole is slightly bent.  DO NOT TRY TO FORCE IT DOWN.  Put the plexi trim on a table upside down and heat the middle using a torch or heat gun.  It will start to arc up in the middle.  If you get any bubble don't worry they won't show.  Heat slowly and test fit till the desired shape is achieved.  

Next is preparation.  The panel need some way to be secured so it doesn't flap around.  I left mine a little tight at the front,  at the emergency brake side I made a tab from 1/8" plexi and used a small piece of 1/8" plexi to space it away from the bottom a little.  I attached the tab using epoxy to the bottom as you can see in the picture above.  After the base of the gauge is set you will need to scratch the entire surface of the plexi so the paint and fiberglass will have some thing to bond to.

Next is positioning of the Gauges  I used Autometers 2-1/16" angled rings that I bought in a set o 3.  You will need to position them in a way that will be the most visible from the driver seat and not obstruct or be obstructed by the shifter.  After you are satisfied mark there location and remove the panel so you can epoxy them in place.  After they are set you will need to cut the bottom of the panel so the gauges will fit through.  I used a dremel.

Second to Final step is fiberglass  I used an old shirt and stretched it over the gauge side only and adhered it to the back using spray glue.  To make sure it stayed tight around the rings I took the hole I cut out of the plexi and drilled a hole in the middle about an 1/8" and fed a stiff wire through.  I pulled the wire tight careful not to break anything and tied them together so the cloth was pulled into the ring.  After everything was set and not able to move, I applied a fiberglass resin and hardener mixture,  carefully so not a lot of sanding would be  needed.  I didn't get any on the underside or on the plexi inside the rings but make sure to get the top of the rings.  If you cover the center then the plexi will be hard to move as with the bottom.  A wrinkle or two near the shifter hole can be sanded, and may not be avoided.  With the fiberglass set it should look like this.  Be careful not to use to much hardener with the fiberglass or it will crack the plexi-glass.  Don't put fiberglass anywhere it's not needed

Now all that's left is to fill, sand, and paint.  I used Bondo to fill any imperfection and give the shifter hole some depth.  After the shape was set, I sanded it down smooth.  in-between sanding give the a light coat of black paint so as you sand you can see the low spots that are left black.  After you are satisfied with the shape and smoothness of the panel all that's left is to paint it the desired color.