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I have a `83 el camino W/ a 250c automatic trans. I am installing a hurst promatic2 ratchet shifter and I`m having trouble locating the back up switch to wire it in. Can anyone tell me where it`s located? thanks
 

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The original back-up switch should be on the steering column, under the dash. Using an 82 schematic I show the back-up wires as light green and dark blue. These are in a connector next to the NSS connector containing a black/white and an orange/black wire.
 
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