Square plugs that run below intake manifold on engine harness. I know the rear speed sensor plug on an auto engine harness has 4 wires, where as the the sensor on the r154 only has 3 wires. The plugs are plug and play as long as the one on the tranny hasn't been cut off (like on mine :cry
. I still haven't gotten around to wiring it up since the colors are completely different. I understand that the 4th wire on the auto harness is for the ECT which is no longer used, but the remaining 3 wires are all different colors than those coming off the r154 speed sensor. If you get yours hooked up, I'd appreciate if you could PM me with what wires match match up from the r154 speed sensor to the auto wire harness.
***Crap, just realized you swapped in a 1J. Thought you were doing the common AT-MT swap, so just disregard my post as I'm referring to the 7M harness. However, it wouldn't surprise me if the 1J's was similar***