Well, mostly I'm just under the impression that the ST185 harness should drop onto the SW20 engine, just because it's basically the same engine, the harness just goes to a different place on the SW20. I.e. I should be able to use that harness and make the engine into what is basically an ST185 engine. I'm going to have to do the rewiring fun that Chris D's written up to use the 185 harness with my 165 fusebox, but I can handle that, as opposed to rewiring the MR2 nightmare harness to do that.