It's the one in the loom with the clear insuraltion, and when it goes, it burns this, and the loom tape insulation on the outside, and will allow you car to start, but then immediately die.
Mine blew because I run a 12 volt coil, not a 9 volt, and up until the drive was working fine. But over time, it gets hot, and there you go. So, if you wanna use a 12 volt, this either has to be bypassed, or replaced with non resistant heavy wire.
So, spent yesterday stripping the loom from the dash and investiagting this... You would be forgiven for thinking it was just a few inches long, and crimped into the ignition circute... Yes, it is, but it's about 2 meters long, and goes all over the shop.
Note, the Haynes wiring diagrams are not bad, they do at least explain which wires this thing is patched between.