Ok,

So I grabbed a wiring diagram from Lexus for my 92 Sc300 5psd (aristo Swapped). The speedo is dead, but I know its a wiring/sending unit problem as I swapped a working cluster and no change....

According to the diagram it's the blue/red stripe wire that goes to speed sensor NO 1. Being that the wiring harness is from an aristo, odds are that color is different. At least I know it runs right from the sensor to the gauge.

Are there two speed sensors on the W58 spd, and if so, which one controls the stock cluster? I know ONE of the sensors is on the drivers side (LHD) in about the middle of the trans. Thanks!