Klaus,
I think the set-up may be different on the '98. The two leads connect to tuning fork shaped probes inserted into the glass tube.
I searched some engineering sites on the web and the sensor may be what is known as a "vibrating fork." It works by sending a frequency from one fork to be received by the other. The change in the level of immersion in the fluid (process medium) will cause a change in the frequency and trigger the light.
I'm not an engineer and my interpretation could be way off base.
My previous car, a GM make, did use a conductive probe sensor.
Bryan
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