Your alignment on the speedometer cable is off. This happens a lot on older Geos. Take it to a mechanic and have them speed test it and re fit it.
Because it Works?
If speed indicator works probably a bad gear in the speedometer head
The speedometer measures the speed of a vehicle, which is a physical quantity related to the distance traveled and the time it takes to travel that distance. This involves concepts from physics such as velocity, acceleration, and motion. The speedometer works by converting rotational motion from the wheels into a linear speed reading.
It does not have a fuse, the speed sensor works the speed-o-meter \ \ I disagree, because the Radio fuse , in the fuse box under the hood will work the speedometer, Tach, and Message center
Jet Accu Speed Speedometer calibrator. It adjusts your speedometer for bigger tires or gear change. Only works on automatic transmissions.
Speed on a speedometer is typically represented as a numerical value that indicates the vehicle's current speed, usually in miles per hour (mph) or kilometers per hour (km/h). The speedometer features a dial or digital display that moves or lights up to show this value, often accompanied by a needle pointing to the corresponding speed on a calibrated scale. In some vehicles, additional indicators may show average speed or speed limits.
I think there is some kind of speed sensor attached to the transmission. Probably a bad conection, a true Chevy trait. VBdenny
for the check engine light go to autozone and they will diagnose your engine for free as for the speedometer you will proobably have to replace the speed sensor
The speed sensor is bad.
Broken speed cable. probably doesn't have a cable it works off of a vehicle speed sensor. it could be bad
the speedometer on focuses is controlled electronically by a speed sensor located at the rear of the transmission on left hand side of car. it would appear you have a faulty sensor.
Stepper motor for speedometer has a broken gear in it, causing unpredictable operation. If the odometer is still working, then the speed sensor is OK. Instrument cluster needs repair.