I got a box of extra parts with my 67 GTO and one of them is a hood tach in the old original GM parts box. The receipt is from Gillman Pontiac dated 9-15-1968, so I'm assuming that it was purchased by the owner back then but obviously never installed. Since it was a dealer installed option in 1967, I've thought about putting it on the car but need a template for the hole I would need. To avoid screwing it up, if anyone has one of these or can give me the exact dimensions of the hole it would be greatly appreciated. I believe having a 4 speed with the 400 and not having a tach is just sacrilege. Rather than replace the clock and have to fool around upside down under the dash putting one in there, the hood tach sounds like the logical thing to do. I've made some paint repairs on the right front fender using matching N-2 Burgundy from Paint Scratch Inc with MAX 2K clear coat and it came out terrific so matching the color is not an issue for this addition and I can do that off the Thanks.