Under dash wiring harness - LS swap

[MickinKY]

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?

 

[overkill19]

BRP Hot Rods: Gauge Components

Maybe this?
It’s worded goofy! 1969 and earlier
1969 and later…????
Kinda sounds like the are both for 1969 and older in my head!


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[MickinKY]

Oh, I like that! Thanks!