$30? I'm really interested to see how that works!There are companies already making these, all Chinese manufactured. I'm looking for a recommendation from somebody who has used one.
Example: https://www.amazon.com/Binwen-Multi...d=1490357056&sr=8-6&keywords=heads+up+display
I just ordered an OBD2 Bluetooth sending unit to use with a monitoring/data-logging app.
Navdy is crap, not even 10% of what they promised it would be.