Michel
You are on the same page! I thought of a stepper originally, The problem with stepper is that they move relatively, ie they can 'get lost' if they dont pass thru a reference point. So i decided to a futaba servo with a linear converter (see
http://www.emsjomar.com/linear.aspx) The code is so
basic as to be trivial instead of triggering the injector, (timed to the points, for a duration) you simply output a pulse between 1 & 2ms long every 10ms, I dont think it would be more than a couple hour work
Neven