Tachometer?

I'm not sure this is where it goes... but I have a question about installing a tachometer.

So I have a 65 dart gt, which I love, but it's weird to me not to have a tachometer. I like knowing my rpms, especially when shifting it myself. I'm good at going off sound, but I'd still like to know..

So I'm wondering if there is a way to install a tachometer onto this car? am I going to have to tear a ton of **** up to do it? How difficult would this be?