My Technique
Dennis-
If your rig is designed correctly, the V1 should be larger than the D2 and V2/D3 -- it is carrying the load of both. I would guess those smaller wires would be 3/8 or smaller - meaning you can use a large Loos guage.
On my boat, the D2 has a turnbuckle, but the "upper" does not. I tune the "upper" to roughly 12% by tightening the big turnbuckle on deck. I tune the D2 to 10% since it is so short.
From there I go sailing and tweak it...
Good luck,
Bob
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