My rod diamond wires are 2mm. I have been told that the rods are really stainless music wire.

I have a rod gauge but 2mm is the bottom of it's range and my "rod" is a different alloy. Mostly I use a Loos gauge and don't worry about what the numbers mean in Lbs.

If I had to set your mast up, I would match the spreaders and prebend of an existing mast and use a gauge to repeat that setting.