[37 Coupe]

I have an old Bosch coil on my Model a '31 that I know works so I planned on reusing it.Today I finally got around to reinstalling the popout switch and new wiring.Problem is on double checking my coil ,wiring schematic and Les Andrews book I notice the coil does not show which post is positive and negative,no + or - nothing. So should I go ahead and buy a coil that is probably going to be China made or this: does it matter which post or terminal I declare positive if I put correct connections on one side and correct on opposite side? Or like I said by a new coil? I also installed the NuRex temperature gauge on the bottom of the gauge panel with the mounting fixture that fits in two bottom holes and gauge is loose in the bracket.What needs to be done tape gauge body to make a fit? Just seems like evry step is an issue nothing ever easy.