If you put a piece of paper in the contacts of the EOS switch, then you can take an ohm reading of both coil windings. Measure the green arrows and then the red arrows. What do you get on each winding?

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No, also when you are checking for ohms you don't need the power on.

You should move the dial clockwise 2 clicks and retest.

You should have gotten a reading of 3.3/350. I would say its time for a new coil.

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That really depends on how loose everything is. If it's not too bad then just a coil. I would test the other coil just to be certain that it's just this one.

Yes you can use those switches. You need to pull the old switch apart and reuse some of the spacers. In the pic you need to remove the ones marked in yellow. Also if you look at the green arrow you will see the screws are a bit too long so take one of the spacers that you removed with the old switch and reuse it under the screw heads, this will keep the switch in the same placement but the added thickness will keep the end of the screw from coming to close to the coil winding and damaging it.

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