Quote Originally Posted by Mickeymotormount View Post
I think you're hooked to the wrong wire. My '93 truck schematic has the light blue/black wire going to the speedo.The dark blue wire is the Rear Wheel Antilock Brake wire. If you pull the instrument cluster and look at the plug, there are letter designations for all the terminals on the plug. Letter designation "S" should be the light blue/black wire. This wire is the speedo wire. You can either snip it here and run your green wire directly to the plug or snip it at the buffer box being sure to eliminate the buffer box from the circuit.
Whats weird is the way u see it hooked up in the pic, my speedo worked with my old vss harness connected at the rear transfercase. So I had the green wire spliced to the blue wire, then I had nelsons vss connector for the input, and my obs harness for the vss output....and the symptoms were it didnt want to shift ( obviouisly)....BUT the speedo worked back then. When I hook up nelsons rear vss output on the tcase, the speedo doesnt work.