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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.
Pull the speed sensor from the transmission case and if there are any metal filings on it clean them off and replace it. If there are not filings you may need to replace the sensor. The speedometer head itself or wiring conneftors could be the porblem as well.
I'd pull the speedometer sensor out of the transmission and wipe it off. Sometimes, a bit of metal will get on the sensor and mess it up. If that doesn't work, I really don't know what to tell you as I don't mess with the electronics on the newer bikes.
Hi Deloway, the number one offender in this type of situation is faulty wire connectors. Get out your test light and check for continuity at all connectors, from the tachometer all the way back to the istrument fuse if necessary. Look for "CORRODED" loose or broken wire connector pins/sockets. For more information about your issue, please visit the websites below, and for specific information or questions, please feel free to contact me at email@example.com. Good luck and have nice day. Harley Davidson Wiring Diagrams and Schematics
Just make sure the cables are not binding or too short. Replacing the risers are pretty straight forward. Remove the four hold down bolts then remove the stock risers. Towel will help here to prevent handle bars from scratching the tank. Helps to have the front wheel straight before starting this process. Install the new risers using the hardware supplied. Be sure to check clutch and throttle for binding BEFORE riding. If they bind and prevent easy operation you may have to purchase extension cables. Be sure to torque the 4 bolts that hold down the handle bars properly. After a few trips check and tighten again to the proper torque settings. Installed the Baron kick back risers on my 1100 and it took a few trips to get use too. After that wouldn't take anything for them! Sitting higher and not all slumped over. Nice looking too!