How do you check the ohms on the ride height sensor for a 2003 caddy deville?

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The air self leveling stopped working and I have checked the relay it's good. I checked the motor on the compressor it's good. I disconnected the sensor at the linkage, turned the key on, pushed up on the rod, waited for 10-15 seconds and more and nothing happened. I then took the sensor off the vehicle and proceeded to ohm test it. The natural position of the unit disconnected is up. I put a probe in the middle of the three pronged plug and put the other probe in the one end, shorting the two, and there is no reading until the arm of the sensor is at the extreme top. When I shorted the other end of the plug to the center plug, wire, the reading was to the extreme other end of the arm movement and like the first reading nothing until I get almost to the extreme point of the travel of the arm. Although I do get readings, one is---93.3 extreme top as travel goes down to less than a fraction of movement the numbers top out at 196.0. Reversing the probe on the end to the other end, leaving the middle probe where it is the readings start at about just a little over three quarters of travel, almost to the end, at 198.0 and goes down to the end of the travel to a reading of 105.0 Did I do it right? Is the gap of no readings between the travel normal or should there be a consistent and steady rise and decline throughout the full travel of the arm? Thanks Don