DCB,
If someone wanted to throw you a bone for all this damm good work you are doing, could we do it by Paypal? As for me i have collected all the stuff needed to put unit together but just have not had time to get started yet. Only thing i see so far as needing some work is power supply filtering and sensor interface, automobiles can be a nasty environment and you will have all kinds of possible problems if these areas are not done properly. We may also need a peak to hold converter for those cars that have that type of injector. Here is a nice link on injectors.
http://www.megamanual.com/v22manual/minj.htm