I should have included more detail.
I have a nick in a wire of unknown gauge that I want to crimp splice to repair. The insulation is red, but was added on. Other than measuring the conductor core diameter with calipers, is there a way to know its gauge? I have a three-pack of three different heat shrink connectors and would like to use the right one, let alone keeping the wires whole when stripping the insulation. I have calipers and will measure it; I'm wondering if there's a better way to know.
You say I "crimp once where the sleeve is," but I'm unsure of your meaning and don't know what the "sleeve" is. Basically, does one crimp using a single crimp ratchet tool hold both wires in place? That would mean putting the crimper in the exact middle and having its width overlap both wires' ends with one crimp. I don't think that's what he meant, so I'm asking.
I think the way it's done is to put one wire end in, then crimp; then put the other wire end in and crimp the new one. True?