[MethoD]

Ok, I think I understand. Since the 0-5v signal is conditioned there would have to be a slight delay between the actual and conditioned output.

I do have a spare digital input on my ECU that I could probably use the raw pulses, but I don't think I need to. Because of the way I am using the flow signal, if the signal is slightly behind the flow, then that should be ok.

If fact, because of the distance between the meth nozzles and the throttle body, there is no doubt a slight lag between the time the injection starts and the time the meth really starts hitting the cylinders. So in effect, the conditioned output from the flow meter may be more reflective of what's actually going on...

Thanks
M