It's on the top side of the tranny, looking down at it. Look close to the firewall, and to the left of the brake booster and all that crap. Its the only thing with a wire coming from the top. Its directly above the driver's axle. I'll try to take a picture tonight.
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Eric Waterman
1996 200SX SE-R
1997 200SX SE-R
1991 Sentra SE-R