68 Barracuda aftermarket tachometer

The one that Classic Industries and others sell is made for the instrument cluster with the correct mounting bracket. I think it is made by Charger Specialties. This will probably fit better than just any 2-5/8" tach. It is 0-8000 RPM and would have newer electronics which is an advantage for different type of ignition systems.

I personally liked the look of original '67 much better and waited until I found one. The original only goes to 6000 RPM. I've also seen where people said that the older original tachs need to be recalibrated.

Of course after I paid too much for mine, one came on eBay for a lot less -- but that's another story.