Speedometer sensor is not driven by the front wheel

i thought they were an analogue speedo on them with the drive on the front wheel and driven by a speedo cable.

Speedometer and tachometer are completely separate on that bike. The tachometer is driven by a sensor in the crankcase, and the speedometer is driven by the rotation of the front wheel.

The tachometer electric wire may have become damaged (common problem), and a replacement wire may be bought from Harley. Also, verify that the gauge itself is operating properly by attaching a 9v battery across its wires very briefly, to see if it deflects. If the wire is good and the gauge is good, the rotation sensor in the crankcase must be replaced.

Is your speedometer cable driven or electronic? If its cable driven, its off the front wheel and either the cable is broken or the gears in the wheel are broken. Electronic...its dealership time.

Remove the air filter, cut the gas off, drain the carb float bowl.

That should fix it!!

Have you had the front wheel off recently?

There is a magnetic speedometer sensor at the front wheel that is easily and often broken if not aligned property. Replacing that magnetic sensor should cure it.

Also, there is a wiring harness under the speedometer. Remove the 3 bolts holding on the speedometer, and carefully lift it up and check to make sure the harness is plugged together tightly.

Wheel sensor use a magnetic pickup at the wheel.

The transmission has a VSS or Vehicle Speed Sensor installed on the area where the speedometer cable, gear usually is.

Speedometer Driven Gear REMOVAL & INSTALLATION NOTE: The 1992-95 S20 transaxle uses an electronic Vehicle Speed Sensor (VSS) and therefore the following procedure does not apply to it. Fig. 1: Speedometer driven gear assembly removal - GV and GW series transaxles

1. Raise the vehicle and safely support it with jackstands.
2. Remove the 10mm bolts and the holder plate.
3. Remove the speedometer gear holder.
4. Remove the driven gear from the holder. To install:
   
5. Replace the driven gear if worn or damaged.
6. Install the driven gear to the gear holder.
7. Install a new O-ring to the holder and lubricate it with oil.
8. Install the assembly in the transaxle aligning the slot with the holder plate.
9. Tighten the bolts to 9 ft. lbs. (12 Nm).

The speedometer Gear drive may be going bad. Or it could be if your speedometer is cable driven the cable just needs lubed. On the side of your transmission near the rear you will see a small gear box with wires or a cable. Place a pan under it and remove it from trans. Check gear to see if it is chewed or worn. If not and you have a cable driven speedometer use graphite cable lube on cable. If this don't work it could be in the cruise control or speedometer.

Have you had your front wheel off at any time?

What usually happens is the magnetic speed sensor at the front wheel was not lined up properly when the wheel was replace and it broke. A very common occurrence.

Check the wiring harness under the speedometer to make sure everything is connected tightly.

Have you had your front wheel off at any time?
What usually happens is the magnetic speed sensor at the front wheel was not lined up properly when the wheel was replace and it broke. A very common occurrence.

The speedometer, trip odometer and odometer are all driven by the speed sensor at the front wheel (NO CABLES).

Try the simple (but time consuming) test indicated in the attached image.

What type of car is it? Most front wheel drives have a 3 wire plug on the top of the transmission.