Hi Ms.Hays Lee,
I'm assuming you're planning on using connectors something like these.
Wires going to engine sensors tend to carry very little current, so I would use the smallest connector that comfortably fits over the wires and allows the two stripped ends to overlap in the middle. The general case for butt connectors is that red is the smallest, usually meant for wire gauges from 22 to 16 AWG, blue is the middle size for 16-14 AWG wires, and yellow the largest for 12-10 AWG. So it's really the size of the wire that's usually used as the guideline for the butt connectors rather than the amount of current (wattage) going through them.
For sensors, I'm comfortable recommending the red ones; they will almost certainly do the job just fine.
If you want to get fancy, there are also connectors like these below that have heat shrink material instead of the plain plastic outside; you crimp them then heat them up to seal the ends to help keep water and contaminants from getting into the wire and corroding it. Not a bad idea for wires inside the engine compartment.
Good luck with your repair!
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