L2550 tach needle jumping and not reading

[dracormbd]

Tach Cable from motor to back of tach appears to be spinning ... don’t know if it’s a magnet issue or spring problem, or even if needle is loose...what are your thoughts..new panel is $366

https://share.icloud.com/photos/08bt4E8_si_YXGOZbqtC1xGhg#Afton,_NY

 

[Dave_eng]

When any cable driven meter acts like yours the problem 90% of the time is in the cable.

The cable is not rotating smoothly. Often on more modern applications there is a smooth plastic lining inside the outer cable which has worn through.

Make a small metal piece so you can drive your tach with an electric drill.
If it then is stable you know it is the cable.

You can lube the cable but risk its rotation moving lubricant into the tach head.

A new cable would be best.

Dave

 

[dracormbd]

thanks Dave....did the video play well enough to see the function?

 

[Dave_eng]

thanks Dave....did the video play well enough to see the function?

Yes the video was excellent
Dave

 

[dracormbd]

thanks for your time Dave, and I ordered the cable....wont get to put it on till middle of july. let you know how it goes...