Yup, that's a thought too, similiar to the piezo tach sensor that diesel_john mentioned (though I haven't yet sorted out that signal yet).
I would like to know why the modulator (variable quantity adjuster) branches into two leads going into the ecu.
I need to understand more details on the various signals though, hopefully my picscope is up to it. Might as well get probing
I did get the instrument cluster out, was pretty trivial, so vss,batt/ground, and even rpm are easy to get to. But the ECU under that plastic thing was a royal pain, will probably work off the pump connectors and the cluster. Need to route kill switch leads through the firewall anyway (think I will leave the intake diverter valve out of it for now)
This thing has a lot going on, that is for sure.