Erractic Tachs on a 450 sundancer

[SEYachts]

:huh: When start my engine thet tach fly all the around to 4000 rpms then once the engine idles it come down but its off 500 rpms even when I am running Does any one know how to adjust the tachs on 3126TA Cats?

 

[920richardf]

Carefully remove the factory tachs from the panel. Replace with digital tachs from Aetna. This adjustment was successful for me.
The original tachs have a poor reputation for reliability.

 

[The Bill Collector]

I found cleaning all of my tach wiring connections helped bring them back to reality....