Hi I have an Acura 3.2 cl base model

And I want to install a vacuum gauge and I'm not sure what a vacuum line looks like can you guys help me out?

 

First off, why do you want one? I'll grant that they are among the more entertaining gauges you can mount because the needle jumps all around, but in fact they give you nearly no useful information while driving and not much useful information even when the car is stationary and you are doing a tune up or something.

But if you must: It will be a black rubber line that is very flexible and about as big around as a pencil. It will attach by sliding over a tube sticking out of the intake system somewhere along the line, preferably directly from the intake manifold. When you find one the best way to tap into it is usually to just cut the line in a place that suites you and then inserting a T-fitting in both ends of the cut leaving you the third arm of the T to attach the line to your gauge.

 

Look at the back of the intake manifold, there are plenty of vacuum lines you can T off of.