The speedometer cable connection is on the transmission tail shaft housing, drivers side. They went electric (no cable) in 1988 in the trucks.
Check the side around the tailshaft.
no fuse, it is cable driven, not electronic
If the transmission a computer shifting transmission, then you need to hook up the eltronic speed sensor to be able to read speedometer. The gear reading is on the dash column, in which a wire hooks to the steering column.
its on a 93 GMC Sierra Pick up it was working fine and then just one day it just quit
It shouldn't have one. The speedometer should run off a signal from the vehicles computer.
How to adjust the linkage on cable from steering column to transmission on a 1995 GMC Van?
in newer vehicles such as yours it doesn't have a speedometer cable, its all electronic in place of the cable theirs a sensor on the transmission on the drivers side behind the shifting bracket, your sensor is probably bad, or even worse the gauge cluster may be bad. Its not like it used to be just replace 1 gauge, or a cheap cable it a expensive sensor or a even more expensive gauge cluster
I have a '87 GMC Rally STX van, but I think the vehicle speed sensor is similar; The sensor is located just behind the speedometer in the instrument cluster on the dashboard. You access it by removing the instrument panel (carefully). You will need to disconnect the speedometer wire and the electric socket before pulling the instrument cluster out. The vehicle speed sensor is a very simple and reliable component. Not likely to fail. From what you say about the speedometer 'shutting off', I would be inclined to think there is something wrong with the speedometer wire. This component won't last for ever and is probably worn out. Unless your transmission is electronically controlled (don't think the '92 models were), I don't think replacing the speedometer wire will address your transmission problem. I believe that is sorted out within the automatic transmission unit. The TV-cable must be intact and correctly adjusted for the transmission to shift correctly. The TV-cable connects the throttle with the gear-box. Hope this is helpful information.
Probably a faulty speed sensor, it is mounted on the rear of the transmission on the drivers side.
check pig tail at speedsensor at rear at trans case or trans. or if that fails change vehicle speed sensor
Possibly a bad vehicle speed sensor (VSS). This sensor is usually located in the side of the transmission.
May have to take the truck to a certified speedometer repair shop