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The hole that was filled with a tach was originally used for a Rally clock. 68 GTO rally clocks are one year only.

As for the hood tach. You will have to drill/cut a hole in your original hood, which I would recommend against. Also you will have to buy or splice into your original wiring harness in the engine compartment. The hood tach does not have pig tails, but a plug that will have to be plugged into a modified wiring harness or aftermarket, if an original cannot be found.

I hope this helps and if you decide against the hood tach, just use the one you are going to be removing from you dash. Find/Buy a mounting bracket for it and mount it either down buy the console or on the steering column.
 
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