Doug,

Thanks for the response. All the instruments I am installing are new.
They are going on a 1970 Chris Craft that is nearing completion of a
four year restoration. I am looking at filtering to avoid problems
before they start. The boat is in Tampa and when I get it in the water
I will be leaving to take the boat back home to the Caribbean. I will
not have time to play with things very much before leaving so I want to
fix it before it breaks. The only shake down will be as I cross the
state to the east coast through the river & canal.

Tell me more about these ferrite beads. An Autohelm autopilot I have
(will not be part of this installation) included installation
instructions to use them. The instructions did not go into detail on
why they insisted I needed them.

Thanks again,

Earl