1999 R1100RT Tachometer not working

[billyfeet]

I have been having issues with the tachometer on my R1100Rt….initially it seemed as if it was reading less than actual RPM but was always giving a reading with no wiggle of the needle…..just perhaps 1,000 RPM low at a real RPM of 4000. This was consistent for 3 months in the spring when I used this bike over a 2,000 mile period. I just got back to where I have stored the bike since April and started it up today. Bike was on a battery tender, battery was new in February. Bike fired right up, starter working great. Now the tachometer does not read at all…..no bouncing…..nothing. Bike runs smooth, no missing or hesitation. I do not have my manuals with me so need advice as to possible cause. I am familiar with HES being a problem on these bikes and I think it is original on this bike…19,000 miles. But it has never failed to start, never cut out or misfired, and. O tach needle bouncing. Any advice as to how to troubleshoot this is appreciated.

 

[20774]

Something similar here? From the Similar Threads pane:

Strange tachometer behavior

My R1100RT has been sitting idle for 1 1/2 years. The battery was totally dead even though it had been on a maintainer. I purchased a new battery and installed it. The bike fired right up and seems to run just fine. I have only done some short rides since and have noticed that the tach does nor...

forums.bmwmoa.org

 

[billyfeet]

Something similar here? From the Similar Threads pane:

Strange tachometer behavior

My R1100RT has been sitting idle for 1 1/2 years. The battery was totally dead even though it had been on a maintainer. I purchased a new battery and installed it. The bike fired right up and seems to run just fine. I have only done some short rides since and have noticed that the tach does nor...

forums.bmwmoa.org

That was my post in the Spring….. ow tach is totally dead.

 

[AntonLargiader]

I have a few lying around.