Thoughts on the 1uz tacho setup, wouldn't you just be able to join the two negative coil terminals to get a signal that has one pulse per fire of EITHER of the coils and then put that into your voltage spike tacho (of course if it's accepting a V8 signal).
Ofcourse, if your 1uz ecu has a "tacho out" and your plugging it into a square wave tacho, you'll have no worries.
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