Do you have an aftermarket flywheel if so which one. The tach issue makes me think it is indeed a cps or ckps sensor issue. Some aftermarket flywheels can wipe out the tip of the crank sensor. Try pulling the cam and crank sensors and cleaning the tips of them the crank is behing one of the heads down by the trans and the two cam sensors are the little black plastic ones on the front covers. See if they are damaged or covered in crap.
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