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If I remember correctly, back where the engine connects to the transmission
The transmission range sensor is located underneath the battery and battery tray on the left side of the transmission. It connects to a wire harness and from there to the transmission it self.
A harness
The harness for the transmission speed sensors is on the transmission.
The cable that controls the speedometer needs to be replaced more than likely. That is what had to be done to a Dodge Stealth's speedometer to work properly. ==New Answer == Actually - there is no speedometer/odometer cable on a 1993 Honda. The system is all-electrical. So it has to be either a bad wiring harness/plug connector, OR a bad speedometer head (unlikely).
a harness
The speed sensor on a 1989 Acura Integra is located on the transmission. It is a small unit with a two-wire clip which connects to the main engine harness of the vehicle.
http://www.the12volt.com/installbay/stereodetail/1685.html try this link.
Against Federal law to do so Can't be done, unless you want to keep the truck parked the rest of your life.. The speedometer is electronically driven off an impulse sensor from the transmission to the computer.. If you unplug the harness from the transmission, the engine will not run correctly.. Emission controls are linked into engine rpm, temperature and vehicle speed. The days of fooling the vehicle are over.
Check wiring all along the harness. If the tranny is shifting up or down suddenly and for no reason there could be a short in the harness. 90's ford had a problem with this. May need a new harness or have to make one up yourself.
You will have to change the computer and wiring harness I believe. The 95 is most likely an OBD I, and the 2000 is an OBD II. If it is one of those OBD I and a half, or whatever they called them, you will still have to swap the computer and wiring harness. I don't know if GM used the I and a half on the Achieva, but they did on the S10 Blazers in 95.
The output sensor is on the top of the transmission closest to the driver side. It connects in a harness that plugs into a connector toward the front of the car which then goes to the input sensor which is toward the bottom.