Service manuals were usually printed in August prior to fall production. Since the 120 MPH / Seat Belt Warning instruments were used after Dec 31, 1971, the new modified harness would not be in the service manual.
A Service Bulletin was issued detailing the changes as shown in post #12
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Ed
1968 GTO (Thanks Mom)
2006 Silverado
2015 Chevy Express 
2024 Cadillac LYRIQ
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