Tachometer - irregular movement

[GLWilliams58]

Anybody have any idea why my tach will periodically drop to zero. It happens while idling, using cruise control and even if I am just revving the engine while in park. It just drops to zero, then bounces back to where you would expect it.

I am not sure what the normal RPM is for idling or for cruising at 65MPH, so I can not say whether anything about the guage is accurate. What should be the normal idle RPM and what would be an approximate RPM for level ground at 65mph?

Also, what would make the tach drop to zero, and bounce back? What should I be checking for here?

Thanks.

[GLWilliams58]

Anybody have any idea why my tach will periodically drop to zero. It happens while idling, using cruise control and even if I am just revving the engine while in park. It just drops to zero, then bounces back to where you would expect it.

I am not sure what the normal RPM is for idling or for cruising at 65MPH, so I can not say whether anything about the guage is accurate. What should be the normal idle RPM and what would be an approximate RPM for level ground at 65mph?

Also, what would make the tach drop to zero, and bounce back? What should I be checking for here?

Thanks.

[max49]

About 6 or 700 RPM for idling and 65 MPH should be around 22 2300 RPM.
I'd be willing to bet that you can thank Actia for your tach dropping to zero. Many of These instrument panels are infested with electrical glitches. You'll probably just have to get used to it. I thought I got lucky and my instruments went 'off the chart' at the WH svc cntr. They still did'nt fix it because they turned it off and back on and miraculously, it fixed itself. Til it does it again.

[Captain Bud]

I can feel for you, I to am the owner of one of these Engineering abortions, This has been a known problem for years, but due to $$$$ the WH folks refuse to fix it properly once and for all. All we do is bring it to a WH center and have it replaced or reprogrammed.

[GLWilliams58]

Thanks guys. I can see from the WCC site that my MH has already has been serviced for the Actia campaign (50402-C Actia Instrument Cluster Jul 7 2005), so I thought it might be pointing to another problem. I am leaving on a weekend journey and will just keep an eye on it and see if/when it happens.

Thanks.