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Battery voltage is good. The drop is normal. No tach bouncing means no ignition signal (hence the no spark). No injector signal either, since your test with the noid light failed.
That means the ECU probably doesn't get a reference position to start the engine.
Either your ref and/or speed sensors are bad or disconnected, or the ECU circuit that is processing their signals is bad. Keep your fingers crossed as this circuit is NLA.
But your next step is to check both sensor signals at the harness side while cranking, preferably with an oscilloscope. Or, with a voltmeter in AC position, speed sensor should show 1 V or above, ref position sensor should show less voltage but not zero. I guess you have already checked their resistance, which should be around 1000 ohms for both.
Then if your sensors test OK, that leaves the fault to your ECU. You should send it for repair.
Plenty of skilled people here on this forum.
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Gilles
RoW 88 Carrera coupé
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