body dash plugs for the celsior or ls400 ecu u have can easily be found using multimeter
the supra ones might only be found if someone has made their own
otherwise use a multimeter on yr old harness and find where the wires go
early toyotas didnt run the efi relay liek the do on the later ones like on a 1uz
so u might have to do some fiddling round if u want it to be perfect like they do std
as i think yr supra might have half or even less than half of the body/dash wires that yr 1uz will have
