Obd1 motor to obd2 chassis harness ?

[Keefs240sx]

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[brndck]

First things first. Motherfucking PUNCTUATION.
Gives me a headaches just trying to understand what you're asking.

No there is no OBD protocol for a JDM engine that was never sold in the US. There is no cable you can just buy to make it work, you would have to basically start from scratch and write an entire set of OBD software for an engine that never came with it. The closest thing I can think of would be taking an ecu from an Infiniti g20 or sentra SE-r (something that came with an SR20de), and reflashing it for whatever turbo setup you're using. Again this is only a guess. I have no idea if or how it would work. You'd just be using an ecu that came with OBD (assuming it's 95 or newer).