Very cool!
I also wonder if there isn't some way to make things fit without messing with the fenders (and hood?). Gauges seem like they could be adapted with
a small microcontroller and the OBD2 port and any number of output displays (
using a servo to move an analog needle, using an OLED graphic display, etc):
(
or this slightly larger stepper with higher gear ratio for more precision, if needed)