ndgcpr, yeah i'd say that's the b1 plug in your pic, yeah mine is like that, altho it takes 3 big wires with the addition of 3 more wires along the top, and yeah i do believe when i traced the water temp on the old engine it ended up in that plug and it was a light BLUE wire aswell!!
So you may possible have the same body loom plugs.
One thing i found out from my ECU computer part number was it was used in supra's and soarers between a narrow time period which may relate to the plugs they used in that short time.
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