Its odd that you put this up because I had been toying around with the idea of getting something like this made for the Z. I am close to finishing up my Supra build and ended up using a Haltech harness instead of the OEM harness and I like it much better. There are a couple of companies that make similar products that have some really cool features.
Chase Bays offers one for the Supra that has a quick disconnect plug at the fire wall, I think that would be a really cool feature for Z's. [ http://www.chasebays.com/product/toyota-supra--1jz--2jz/chase-bays-products/chase-bays-engine-harness--toyota-1jzgte--2jzgte-for-oem-ecu ]
Madhatter10-6
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