I'm pretty sure that the tach signal is not from the sensor, but converted within the ECU. On the 7.2 ECU it is, but I don't have any reference handy for a '98/2.5L harness. There was some discussion with the LS swaps between John and VLad using a converter. Some of that is here: http://986forum.com/forums/show-tell-gallery/56050-v8-conversion-5.html
If I remember and have time, I'll track it down for you.
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I am not an attorney, mechanic, or member of the clergy. Following any advice given in my posts is done at your own peril.
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