It's made from vacuum formed plastic, all pics are on page 3.
I basically done the following;
1. Cut out a basic template/shape for the front of the pod from cardboard.
2. I transfered the template to a CD case.
3. I took the cardboard template and stuck it to a block of blue modelling foam and modelled a shape i was happy with.
4. Using a vacuum former i formed my shape.
5. I bought a spare steering column cover and bonded the 2 together.
6. Paint and fit gauge.
When forming the front of the pod where the liquid gauge bowed in, this is why I used a CD case for the front of the pod (which you can see in the pics before I painted it all)
Obviously i used a vacuum former which not everyone will have access to. i've been looking at buying one so i can make more but they go for big money
I could've used fibreglass but vacuum forming is far quicker.