Speedo cable replacement?

Mine is currently set at 26 - 32. With that I assume I can use the the 26, 27 or 32 tooth pinion.

Yes, either of those numbers will work in that position, BUT you need to reference the chart or look at what you have in the trans already. It will be specific to tire size and gearing.

Look at the chart and notice the difference in either tire size OR gearing, with each of those numbers.