If the PHS reads hood tach, it is likely the hood was replaced at some point. GM didn't practice billing options and not selling the car as such. It may...and I say may have been that the car was on the lot and the buyer didn't want the tach on the hood and the dealer replaced the hood.
You have no evidence of a harness?
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1967 Starlight black PMD Engineering 400 Auto 1968 Alpine Blue 400 4 speed 1968 Verdoro Green 400 HO 4 speed 2013 1LE 2SS/RS Inferno Orange Camaro.