Sleepy tach fix...

[JoeNashville]

So I had a 'sleepy tach', which it seems is not uncommon.
I had already checked the engine 'innards' when I rebuilt the top end making sure the gearing and cable were okay...
but the tack was only midly better, slow to respond and never seemed to reflect the actual rpm.
After researching I decided to put some light oil in it.
However, being lazy and in a hurry, I did the following:

1. Unbolted the gauges, and with the cables still attached (this the lazy part) I gently turned them upside enough to take a few drops of light oil.
2. After a couple hours I sprayed a shot of WD40 up the hole. (because I've fallen in love with WD40 again) And it seemed it needed some even lighter oil.
3. After another hour I put another few drops of light oil in it.
Having finished my projects and wanting to go for a ride the next morning, I cheated.
4. I hooked up the air hose and blew a couple very light bursts, about 15psi up the shoot. (This is the impatient part)

And all that did the trick. The tach works great, very responsive and quick, another problem eliminated from the list!

[steve murdoch]

Surprised that much lubricant and air pressure didn't cloud the tach face.
Glad it solved your problem.

[Rich82GS750TZ]

Would not recommend spraying anything “up the shoot”. I think you got lucky.

[JoeNashville]

It was very little lube total and very little air pressure. No luck involved, it's all knowledge, finesse and skill!

[allojohn]

You don’t say...

[Cipher]

It was very little lube total and very little air pressure. No luck involved, it's all knowledge, finesse and skill!

Or luck.
;,,,,,,,

[steve murdoch]

It was very little lube total and very little air pressure. No luck involved, it's all knowledge, finesse and skill!

What about your good looks or does that go without saying?

I would use only two or three drops of sewing machine oil for slow/noisy gauges.
Again, glad it worked for you