Several different types of connectors are available for a 1995 Tahoe wiring harness. The best connector to use is a connector that has an adapter that works on older trailers. Connect the wires according to color as the colors are universal. Follow the instructions that come with the connector.
on the inside of the drivers side door. on a white sticker (if it's still visible)
Under the dashboard on the drivers side, it is on the right side of that space. It is typically off white in color.
Probably the vehicle speed sensor located in the transaxle extension housing, or a wiring fault up to the cluster are the cause of the problem. If the speed sensor is faulty, you will also have a fault code 15 stored. See the linked page for more information on how to get the codes. If there is no code for the speed sensor in memory, you may have a wiring fault. The speed sensor signal is carried on a white/orange wire in the left side connector on the digital dash. It splices to a wire of the same color leading to the connector for the traveler/navigator trip computers, and leads to a large 8-way connector forward of the left (drivers side) shock tower. From there it runs down to the distance sensor. Check continuity between the connector in the dash and the 8-way connector. If you have continuity, then your digital cluster may be at fault.
located on the passenger side of the radiator. Single wire (spade connector), I believe it is green in color.
Red
It is located in the data link connector. There are three black wires. It is the bigger of the three black wires.
PS/2 connector, purple
Red
Black coax
It is located above the fuse box above the drivers left foot. A small snap in connector bigger than a fuse, black in color.
not sure the exact location of the wire in the harness, but i can tell you that the speed sensor has 2 wire leads, that run directly to the PCM. they are in ports 20 and 21 on the PCM wire connector. Pin 20 is for speed sensor low signal and is Light green and black in color. Pin 21 is for speed sensor high signal and is purple and white in color