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Originally Posted by t vago
You can use RTV to seal up any holes made in the wiring insulation. That, or F-4 tape should suffice. If possible, though, heatshrink tubing is preferred over either of these solutions.
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Since the "hole" is smaller than a pin-prick it is usually unnecessary. Often the insulation itself is resilient enough to virtually close off the needle hole.
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My personal preference is to strip off the insulation from the signal wire in question, solder the other wire to it, then seal up the stripped part. Usually, I can get the splice near a wiring connector, which means I can take the wire's pin out of the connector and use a section of heatshrink.
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That's the situation if you want to tap into the wire. I've found that the 3-M type taps are usually OK if the wire is in the interior of the car. However if the wire is under the hood and exposed to the elements I have found the taps to be unreliable. Then doing a strip & solder as you suggested and using silicone sealant is the best way to go.