oil sending unit

I need to change the oil sending unit on a 1993 geo metro 3 cyl. hatchback. How to I go about changing it (more details the better).

It's on the very front of the motor behind the exhaust manifold. Un-plug the wire from it, get a good grip on it with some vise grips, and un-screw it. Put some loc-tite on the new one's threads, hand tighten it, and tighten it very gently with a box wrench. It has small delicate threads. Tighten it only enough so it won't come loose, or leak. Then plug the sensor wire back in.