The Crassida's intake is different than the GTE's... it just looks similar. The Supra and the Crown N/A's (ALL YEARS of 7M and also the 2JZ series) ran a very different setup than the Cressida's thanks to the ACIS system and tuning differences based on it.
Those flow numbers for the injectors aren't quite accurate. That's pretty much just a step above the middle of the VERY broad range that Toyota specifies for its injectors and rather hopeful for 20+yo injectors. The 89+ injectors are supposed to flow 276 to 340cc/min, pre89 aren't much less. Toyota also says a variance of as much as 36cc/min between injectors is fine...
. It's irrelevant to me as I won't install used injectors unless they've been cleaned and blue printed... half of the ones you send to the shop are trash at this age. I misread though and thought you meant you were running the newer ECU with the grey plugs, not that it was used to build a Fields harness.
The VSS is labeled SPD in Toyota's publications, you'll probably find more info looking for that. I think most of the Toyota speedometer heads from that vintage provide the same VSS signal.
The oil signal may only be used in the GTE ECU, I can't recall.