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OBD2 96 Nissans had a sensor that counted the teeth in the flywheel ring gear. It was used to accomplish passive cylinder balance testing to determine which cylinder was not producing as much power as the rest the were operating normally.
Sensor was located in the bellhousing.
If that is what you are trying to describe it is not a functional necessity, but a diagnostic tool. It will give you a check engine light on the second start, and will keep doing it after you reset the check engine light. Second start check engine light indicates a non critical malfunction.
Not sure if your OBD2 works like the Nissan cars in 96, but I am pretty sure it was required so you could check cylinder balance percentages without changing or disconnecting anything, like disconnecting plug wires.
Might need to swap the bellhousing to make it work right, but I am no expert on Metros.
regards
Mech
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