The pros are there's nothing like looking at a hood Tach on any Pontiac just makes the car so cool and I love Grand prix's with them they look right at home the con is no Grand Prix in 69 or 70 or 71 ever came from the factory with a hood Tach they were all all all dealer installed if you have a really rare Grand Prix I wouldn't do it to it like I have a 69 SJ HO that has the in dash tach I would love for it to have a hood tach but I won't do it to it but if it's a lesser car, absolutely add it.. it makes the car that much cooler in my opinion
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