[Jays2000ZX3]

It's "easier" to remove the ecu, or just unplug it. All you do is find Pin 60, cut away the plastic on the wire to expose it, wrap the purple wire around it, solder then tape.

What I usually do when I have to just tap into a wire like that is actually cut the wire, strip both sides, put in the heat shrink, twist wire together, solder, put heat shrink over wire and use heat gun.

Otherwise, you can't use the heat shrink.