Aftermarket Tachometer problems on a K1100RS?

[Bikernut]

Just new to this so thanks in advance......
I am fitting an aftermarket Tachometer to my 95 K1100RS and the instructions the tach came with say to 'simply' hook the RPM signal wire up to it. The needle does not even move when I did that. Found a part solution online with an earlier model K100 using a capacitor 10nF 630v and a 100K ohm 0.5w resistor is used in series.
Tried to copy this for my bike and now the needle works but jumps and jerks around 4-5000rpm.
Any suggestions would be helpful thanks??

[Laitch]

Just new to this so thanks in advance.... . .

You're welcome in advance, Bikernut. You'll be helpful if you're not vague about what brand and model of speedometer is the challenge for you.

While you're waiting to be rescued. go to the Home page, go to the search box in its upper right hand corner, type aftermarket speedometer, then click Search.

[Bikernut]

One of these http://www.ebay.com/itm/12000RPM-LCD-Digital-Odometer-Speedometer-Tachometer-For-Motorcycle-Scooter-New-/171837204331
Will try searching too.....:)

[Bikernut]

You're welcome in advance, Bikernut. You'll be helpful if you're not vague about what brand and model of speedometer is the challenge for you.

While you're waiting to be rescued. go to the Home page, go to the search box in its upper right hand corner, type aftermarket speedometer, then click Search.

Thanks for that. Lots of information and it sounds like it is a common issue.....still not resolved yet though. Tried copying a few wiring diagrams mentioned in http://www.motobrick.com/index.php/topic,6814.msg47459.html#msg47459
Still no luck..........