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Spec sheet says 1.5mm air gap, but it depends on the target type. The Subaru ring is on the edge of the recommended specs, so I was worried it wouldn't read well. That doesn't seem to be a problem though.

Finally borrowed a power supply to test that the sensor and ring worked together. I didn't have an oscilloscope, so no waveform, but using a multimeter I could see the voltage alternate between supply voltage and 0 as the ring spun. That was kind of the last box to check to make sure this would work, so I'm basically considering this solved. If/when I grab some T3 uprights and do the final design, I'll update and upload the drawings for anyone to copy.

MSA says they came on the 432 and ZG models, and were options for all others. So I guess not truly "standard".

This is a passenger footrest. If your legs aren't long enough to reach the sloped firewall, this makes it a lot more comfortable to ride along. It was standard in Japan and an option in other markets.

Exactly. If you seal out the air, it'll run out of oxygen pretty quickly and any miniscule amount of corrosion will stop.

Jeff Priddy and Timz have done it. It's just a very expensive endeavor.

If you want to make sure the support structure crushes before the unibody, some pie cuts out of the tubes would ensure that.

Bearings, hub, cap, washer, nut, tone ring, and plastic version of the adapter. The aluminum adapter would add some weight over the plastic obviously, but less than a wheel spacer. The studs are also the extra long racing studs, and there is an additional stud.

3D printers are the best. You could easily make this by hand with a piece of aluminum bar and a washer rather than something machined, but when you can turn resin into solid with the click of a button it's easier as one piece. I can throw a drawing up for this too if anyone is interested. Only downside is that the T3 uprights have a brace that would interfere with the sensor mount, but I could just tie into the lower dust shield bolt on that side instead.

How did you mount the ring? Turn the hub down?

I don't think they do, but I don't have a haltech or motec in front of me. AFAIK every sensor is independent since they're all different inputs.

Meaning the uprights too? Or do you have the tone ring mounted to the 240Z hub somehow?

Eh, the part is going to be custom and pretty simple anyway. You'd just have to get yours with a 5x3.88" pattern instead of the 5x103mm

2.25mm height ~5mm width ~5mm edge-to-edge spacing

What's all part of the package?