cool I've done a few PIC projects in my day.

anything you can tell me about the design? which chip model and language are you using, internal or external clock? I'm curious how "picky" the VX is on the timing... I'm assuming not very since people got full lock by just applying 12V.

Are you adding any kind of power cleaning circuitry? automotive 12V systems is crazy harsh since the voltage and amperage spikes and drops all over the place whenever something kicks on or off.

Have you started working on a PCB layout yet, or are you still prototyping the circuit?

Obviously these are more questions for your brother...

excuse me if I'm excited... but it's not often I get to talk about my love of car modifications and circuit hacking at the same time

I understand if you want to keep the design to yourself for resale purposes.