Bonding Trim Tabs ?

[US1Fountain]

I'm rerigging my cruiser and not sure what to do here. The trim tabs are S/S and the boat is kept in freshwater yr round in a marine slip and has the Mercathode system. Do I run a bond wire from 1 of the trim tab mounting thru bolts to the engine block studs where all the gound wires connect, or best to leave the tabs unbonded? I've read the West Advisor, and did a search here only to be confused more so as the bonding of thru hulls is usually the topic and read both for and against on that.

Thanks

[US1Fountain]

Anyone, or a link to this issue?
Thanks in advance.