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Found the Pig Tail under the center glove box in between the front seats.
Those connectors are for OEM seat heater switches and definitely not the subtank.
I don't think there is a pigtail for the subtank switch on north american FZJ80s, since the subtank was never an option here. But I hesitate to say this with 100% certainty since there is a subtank connector underneath the driver side rear door. So some of the required wiring may be present. You may need a subharness to make it plug-and-play, since in addition to the subtank switch there was also a subtank level gauge that was part of the overhead compass console. Search some of the older OEM aux tank install threads for more info.