Tachometer

I would recommend starting with cleaning the cable and housing, inspecting the cable for kinks and lubricating with a light lithium grease or one of the many cable lubricants available. For most applications, simply lubricating the first 2/3 while reinserting the cable core is sufficient. Beyond that, having the head unit serviced by a professional shop is your next step. Speedometer/tachometer service requires specialized tooling in order to be performed efficiently and accurately.

www.morrisgauge.com

Thanks for the good replies, guys. I'll check into the possibilities.
Albert

I had a similar problem with me Auburn speedo. I had the speedo repaired three times. I examined the cable for frays or any rough spots and could find nothing wrong with it. I replaced the cable casing and cable and that solved the problem. A speedo expert told we that just because the cable looks good the inside of the casing could be bad and dragging the cable which was my problem.
Cordially Mike

Hello:

I'm sure like most Cord anomalies, there will be fifty different opinions on the cause of this problem. My experience would be that since the jumping only happens at lower RPM's, that the cable is your culprit versus the instrument. Cleaning the cable and the cable housing and then lubricating it using graphite or white lithium, not both, should do the trick. If the cable is kinked or frayed, replace it. If that doesn't fix the problem, inspecting and repairing the gauge may be in order.

Mark

The tachometer in my 812 is starting to bounce at lower RPMs, although it smooths out around 2,000 RPM. In addition to disconnecting the cable at the tach and removing the cable to grease it, is it recommended to disconnect the cable housing at both ends and to run some type of solvent through it?

Also, do most 810/812 owners use speedometer cable grease or graphite or white lithium grease?

Finally, if it's not the cable and is the gauge, what do you recommend?

Thanks.