In terms of the flywheel being off 1 bolt, the only problem with that theory is that it runs good when cool. In terms of the sensor, I know quite a bit about different types of sensors but I don't know what is on that car. I am guessing that it is Hall which would mean that there is a magnet that it is sensing. Are you sure it is sensing "tabs"? There would have to be only 1 tab then.

Mike

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1998 C230 330,000 miles (currently dead of second failed EIS, yours will fail too, turning you into the dealer's personal human cash machine)
1988 F150 144,000 miles (leaks all the colors of the rainbow)
Previous stars: 1981 Brava 210,000 miles, 1978 128 150,000 miles, 1977 B200 Van 175,000 miles, 1972 Vega (great, if rusty, car), 1972 Celica, 1986.5 Supra