More info
Dennis-
You have not mentioned your rig configuration, but I am assuming that you have a double spreader rig. I assume the wire from the tip of the lower spreader to the deck is 1/2", and the wire from tip of the lower to the masthead and the wire to the root of of the upper spreader is smaller? If those upper wires are 3/8" or smaller, you can measure them with Loos gauge -- their tension will vary directly with the big V1.
My V1s are 9/16", my D2 are 3/8", as are the V2/D3s -- I measure tension just above the lower spreader and then go sailing to do a real tune.
Do you have Brion's tuning video, it may help you. The tension via a gauge is just a ballpark adjustment, you need to sail the boat and see how the rig reacts (this is dynamic tuning).
Bob
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