I am doing a senior design project involving my GS400. Among other things, I am monitoring the RPM's and Speed. I need to know what color the tachometer wire is going into the gauges. I already know the color of the VSS wire. If anyone knows please let me know, I need to get this working soon. Thanks

 

found this on the search...not sure if it helps because its for a 300

https://www.clublexus.com/forums/sho...ight=tach+wire

 

come to think of it...i've got a super afc diagram for the 400 on one of my computers. I'll find it and find your rpm wire.

 

Tach should be Black with a yellow stripe at the ECU box.

 

Wow, you guys are fast, thanks for the response! I will give it a try.

 

Use the wire behind the RPM gauge or use the SRT's RPM wire. I believe this is the RPM wire to the gauge.