Under dash wiring harness - LS swap

MickinKY

New member
Mar 17, 2021
5
3
I've put an LS5.3 into my 84 C10. the engine bay wiring is pretty time consuming, but also hard to screw up. The under dash wiring is a little bit more tricky. Namely, the black wire is supposed to go to the speedometer. but I have a cable running from the speedometer to the trans. Question 1, do I still need the black wire connected since its a mechanical speedometer and not an electric speedometer? Also, the purple and yellow wires for the brake. There's a few different places they could go on the Brake Switch. Can anyone help me with that wiring?
 

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