I have done quite a bit of programming with Arduinos over the past several
years and would like to tackle this challenge.  I've got an 82 Riviera with
an 89 VW Fox engine the has two Arduinos that monitor and display
temperatures(inside, outside, fridge interior, fridge cold coils, fridge
hot coils) and voltages (main & auxiliary).  Propane fridges become a whole
lot nicer to use when you can tell exactly what's going on inside at all
times.

My current hamster wheel is old school CIS, so it has no idle stabilizer.
I would need someone knowledgeable to detail all the input and output
voltages and behaviors.  I would especially need some input from someone
who's used a scope on the primary side of their coil: what's the duty
cycle? how high are the voltage spikes? are there any negative voltage
spikes?  Microcontrollers do not like going above 5 volts, and a highly
inductive device like an ignition coil is very  hazardous to them if the
signal is not properly conditioned.

Brett in Portland

"Albert", 82 Riviera