Tach needle jumping around...

[JonnyO]

A quick google search showed me nothing. 1981 XS 1100 Special
Couple days ago I thought I was seeing things 'cause I thought I saw the tach needle jump. Today there's no question-it's going to zero and then dancing around and back to zero... but not holding the speed.
Figured I'd ask the pros what the repair entails. I'm hoping the cable just needs to be lubed but have no clue, really. I can follow your guys tips though.
TIA- Jonny in AZ

[bikerphil]

There is no cable driving the tach, it gets it's signal from the alternator. I suspect that maybe the connector plug behind the fuse panel may be the culprit. Before you go digging for it, with the bike running, check your alternator voltage output with a meter at the battery terminals. When you rev the throttle, you should see a decent increase in voltage, 13V+. If it isn't increasing, then I would check that connector for it being melted.

[cajun31]

A quick google search showed me nothing. 1981 XS 1100 Special
Couple days ago I thought I was seeing things 'cause I thought I saw the tach needle jump. Today there's no question-it's going to zero and then dancing around and back to zero... but not holding the speed.
Figured I'd ask the pros what the repair entails. I'm hoping the cable just needs to be lubed but have no clue, really. I can follow your guys tips though.
TIA- Jonny in AZ

Just want to make sure you saw this repair tip from the maintenance section. Tachometer Wobble - XS11.club Forums
If you decide to try to lube that small ball bearing don't go overboard.

[JonnyO]

Just want to make sure you saw this repair tip from the maintenance section. Tachometer Wobble - XS11.club Forums
If you decide to try to lube that small ball bearing don't go overboard.

Thank you for the suggestions! I will post if and when I'm able to resolve.