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Thank you for the very quick reply. I don't have the waveform, but it is described as 12V applied to open the injectors for a time dependent upon load, temp etc. The diagram I have shows the injection of fuel being timed to start at the beginning of the intake stroke and lasting for a relatively short time compared to the inlet stroke. The ECU uses purely analog electronics; it is an early Bosch system.
If the software allows me to select triggering off a positive edge, then that would seem to cope with my injectors being wired up the other way around and I won't need to put in an inverter. Do you agree I will need to tap off from the wire connected to the ECU and supplying the 12V pulses?
I really appreciate your help.
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