Been driving around with GPS latley because your speedo doesn't work? Me too. Enough of that. Take your LS harness and find the rear vss connector with the Blue and Purple wires. Find your OBS rear vss connector with the Blue and Green wires. Connect the LS Blue to the OBS Blue. Connect the LS Purple to the OBS Green. Now access your vss buffer box located behind the glove box. It is the little white box. Find the solid blue wire. Cut it before it goes into the vss buffer box but leave enough room to connect a butt connector. Take you LS speedo wire and the blue buffer box wire and put them in one end of the butt connector, then put the other blue wire coming from the speedo in the other end. Should have a working tach then. It does cause your brake light to come on and I dont know why, but atleast you now have a working speedo. NOTE: If you unplug the buffer box it will cause your brake light to come on as well