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If the point is to maximize efficiency, you would want an ECU in order to have sequential injection phased properly to the intake timing. Otherwise, you'd have to resort to batch or bank injection and would have the injectors firing at closed valves most of the time.
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Well that is how my cars work now, all the injectors fire at the same time once per revolution according to the service manual. For a first test it would be fine, and the simpler the first test the better.
However, the control box could take one trigger input from the camshaft and extrapolate the rest from engine rpm, (or 4 trigger inputs for 4 injectors) to fire the injector at the "right" time. I think it a lot easier to build a control box than to "fool" the original car ECU into doing what is wanted here. In fact a test could use an old single point throttle body with the butterfly valve removed.