It would be correct as an accessory tach for our Canadian Pontiacs except this one has the Chevy bowtie on top. I think there is also one that just has "GM" cast into the plastic top instead of the bowtie.
Neat item, rare piece but what a horrible excuse for a tach!
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1966 Strato Chief 2 door, 427 4 speed, 45,000 original miles
1966 Grande Parisienne, 396 1 of 23 factory air cars (now converted to a "factory" 4 speed)