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My sensor measures just short of 1.5" frm the end to the surface where the sensor sits on the housing.
I stuck a piece of tubing down the hole and marked where it comes out of the hole. The tubing measure 1/4" to 3/8" longer than the sensor. It looks as if there is a gap between the sensor and the Tone Wheel.
I was able to get enough light down the hole, and with a mirror I could see the Tone Wheel. When I turn the driveshaft, the Tone Wheel turns.