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Re: 79 GMC Sierra LWB 6.0L swap
On mine (LT1), I used the original brake switch, and they spliced the white wire to a relay for the TCC. Whoever swapped teh engine in my truck originally used a Painless harness; their installation manual was a huge help repairing all the wiring butchery going on. Try going to their site and downloading their manual. It is at least another reference.
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1974 Jimmy- 5.3/4L80e/NP241
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