So I ordered a hood tach for my 68 ram air car that originally had a hood tack.(was missing when I got it) and when It got here the bolt hold were off. after talking to the manufacturer we think the hood tach was a 67 production tach? My hood has 4 holes in it.the car is am originally ram air 1. 68 model car with an Aug 67 build date if I remember right. So what rpm should it be? 5200 or 5500? Hmm anyone no