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the factory knock sensor at the ECU, to pull timing, you splice between all the coil packs at the ECU.
You can use a boomslang harness to keep from cutting the stock harness.
We have a unit connected to a boomslang harness with our dedicated tuning ECU that has a emulator installed, this allows us to plug into any 1990-1995 Z for tuning.
When the Z was new, the technology for listening to knock was not very good. Other noises in the engine sounded like knock, so Nissan did not allow the ECU to listen to knock after 3000 RPM. It was more or less a bad gas sensor for tip in/ low load knock.
The Knock sensor was not bad, they just did not have the technology to tune out other engine noises.
The J&S unit has newer technology and it has been adjusted to tune out other engine noise specifically on the Z. It captures knock very well so that you can clearly hear knock with head phones. It also has a LED gauge option.
If there is enough interest, I could run a group buy on these units.
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