Print the angle guide and the gauge mount as normal, then assemble the two and use a heat gun, bend the arm to fit the guide, and hold it in place until cooled. Remove the guide and you're ready to go.
It is secured to the bolts behind the dashboard.
Just like the original, print at 1:10 scale.
The author remixed this model.
This is basically the same model, but extended slightly longer to allow the arm to be curved (20°) inward to point at the driver rather than straight back.