The VSS should hook to a pickup sensor on the tail shaft housing, passenger side of a 4L60e. 4L80e has two sensors on the driver side. The rear one is the speed sensor and the front one is the input shaft sensor.
BTW, the 3 wire coolant temp sensor isn't accurate for the OBS trucks. You can use it for reference but I'd rather use a factory sensor screwed into the head.
See my truck data in the "My Garage" section here... http://www.ls1truck.com/forums/my-ga...tml#post191709
I have athe VSS hooked up on the trans but the guy who did my harness has a wire marked as such comoing out near where my pcm. Jim
There's a light blue wire coming out from the instrument cluster that you tap that wire into. On my 92 and 93 the blue wire connected to a DRAC box behind the glove box but your truck won't have one located there. The wire may be going to your original PCM. Cut it and splice into that light blue wire.
See my truck data in the "My Garage" section here... http://www.ls1truck.com/forums/my-ga...tml#post191709
My dash wiring will be different[6.2 diesel]. I tied into the blue wire and nothing, I don't have a dash wiring diagram for the diesel. So I'm back to the start, Can anyone help with my speedometer? Jim
you have an 89 model c1500 diesel?
See my truck data in the "My Garage" section here... http://www.ls1truck.com/forums/my-ga...tml#post191709
Yes, it was a 6.2 diesel. Jim
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